Black Tank Cleaning

The Danger Probably ISN'T What You Think

At Gabe’s Pride, we talk about cleaning a lot! To our regular customers, that’s no surprise. We ARE RV and home cleaning experts. But just like your doctors have an expertise, so do Gray & Blank Tanks. That’s why we reached out to the team at Kleen Tank. We urge you to keep in mind that cleaning the black tank ISN’T like cleaning of the toilet, shower and sinks.


First and foremost, it’s important to understand that this is a holding tank, not a septic system. That means there’s no need to keep beneficial bacteria balanced. HOWEVER, you do need to be careful what gets flushed into your black tank. 


Harmful chemicals such as bleach can damage the seals. Once damaged with bleach these tanks can leak all kinds of foul odors. That’s inconvenient enough. If bleach has been used, when mixed with urine and other organic waste, your tank can leak chloramine gas. And that is a serious health hazard!


Believe it or not, your real goal with a black tank is not to “clean” it but to keep it from clogs and odor. It does help to have it professionally cleaned occasionally by a company such as Kleen Tank but in between there are things you can do. 

 

WATER, WATER, WATER

Water is probably the most important maintenance item. Using plenty of water keeps the waste from solidifying creating clogs. In fact, using plenty of water dilutes the waste which minimizes odors. It also helps speed the process of waste removal for solids when you dump. Remember, more water equals less odor and stuck-on waste.


How to get this stinky job done? We’re SO glad you asked!

  • Always try to keep water in the bowl of the toilet. This will create a “water seal”. This prevents odors from escaping the black tank and the rubber seal from drying out.
  • Fill the bowl halfway before using it. Flush and then refill the bowl halfway again. Flush that. The goal is using 1 full bowl of water for every use.
  • Starting a good habit would include refill the bowl halfway for the next person. 
  • For kids or RV guests who don’t understand “RV Potty etiquette” we suggest you fill the toilet bowl twice after flushing. That would mean: 1 Half-bowl to start and 2 Hal-bowls after your guest use it. A total of 1.5 bowls of water.
  • Take longer showers.
  • In general, keep your tanks CLOSED! 
  • Fill your tanks to at least 75% full before dumping. This helps prevent any issues with the sewer or septic system from affecting your RV!
  • If you are ACTIVELY doing laundry or have multiple people taking showers back-to-back, it’s ok to leave tanks open. Once laundry or showers are complete, close the tank valves.

 

The Key to Emptying the Tanks is… More Water!

  • Keep tanks closed as much as possible. If left open the liquid will run out, leaving the solids to collect on the bottom of the tank. Keeping it closed will also reduce the occurrence of sewer flies.
  • Making P-traps in the “sewer slinky” is not a sure-fire way of keeping bugs out of your tanks. Some types of cockroaches live in sewer systems and can swim underwater. As if they weren’t gross enough already.
  • Wait to empty tanks until they’re three-quarters full to full.
  • After the tanks are empty, use your on-board tank flush. Rinse out any leftover waste. And while it’s best to rinse your black tank thoroughly after each dumping, there are exceptions.
  • If you didn’t rinse the tank after your most recent dumping, you'll want to rinse well at your next site.
  • When filling your tank, stay focused and don't get distracted! It's very easy to forget what you're doing and overfill your tank! A water meter is a great tool to keep you on track. You should use a timer only if you know the flow rate of the water.
  • If you have been boon-docking, you’ll probably be conserving water. If that’s the case, use twice as much water at your next full hookup. This will ensure everything you want moving, keeps moving.

 

EVEN MORE WATER! 

  • On a regular basis, back flush water into the system. Using a reverse flush device like the Valterra Flush King or Camco Rhino Blaster makes this easy. These devices add water to the system from a different direction than the inlets or tank flush. This helps to break up any stuck-on waste. 
  • Flush one tank at a time. 
  • Kleen Tank recommends doing this at least monthly or after every short trip.

 

Using Additives

A lot of cleaning is “applied chemistry”. Questions like needing an acid cleaner or an abrasive surface are straight-forward if you know the answers. However, there are times when the answer is an opinion. At Gabe’s Pride we’re very clear on that because in our opinion, a LOT of the corporate cleaning industry is not.

Tank cleaning companies such as Kleen Tank use a Calgon base solution to coat the tank sides, so waste doesn’t stick. The theory is based on using plenty of water to keep things liquid and moving. Other companies sell additives which they claim “break down” waste. This chemical action is usually accomplished with enzymes. Some swear by these. Others believe this creates sludge, especially if enough water isn’t used.

 

You’ll also find Black & Gray Tank cleaning products. Some manufacturers will claim that when used periodically, these products remove sludge and odors from the tank. Instructions say to fill the tanks, add the product and allow it to sit for a period of time. Others suggest driving to agitate the tank mixture.


Should you choose to use a tank treatment it’s suggested to use the same one consistently. Frequent changes in these may create a chemical reaction. And as with every cleaning product be sure to read the instructions and use the product accordingly. 


Remember, whichever process you choose to use, water is your friend so use plenty of it! When you’re looking for other cleaning tips and tools for your RV or home, check us out at Gabe’s Pride. Our Eco-Friendly cleaning materials are made right here in the USA.


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August 24, 2026
Wax is a crucial tool for keeping the exterior or your RV healthy . Gabe’s Pride does NOT sell wax. But we interact with it a LOT. We found this blog at RV Life to be a helpful, unbiased look at wax options . But it cannot fix existing deep chalkiness. Chalkiness is an advanced stage of degradation on your RV exterior. If an RV's fiberglass has developed severe oxidation, it typically requires a multi-step restoration process. This restoration usually involves compounding, polishing, and then waxing the surface. The CONS for waxing your RV Applying traditional wax over an RV finish comes with significant drawbacks. Time Commitment: The first is the most obvious - Size. Due to the vehicle's sheer mass and harsh outdoor exposure, waxing your RV is a big job. Manually washing and applying paste wax to a 40-foot rig is exhausting and can take multiple days. It’s Temporary: While wax offers a quick gloss, its UV protection and water-repelling qualities typically degrade in just 1 to 3 months, meaning you will need to re-wax multiple times a season to maintain its benefits. Working on Oxidized Gel-Coat: Traditional paste wax will leave an oxidized, faded fiberglass finish looking smudgy, greasy, and streaky. To overcome this, you’ll need to strip the oxidation. This is often accomplished with a polish or heavy wash before wax can be applied. Slide-Out Malfunctions: Waxing the side walls of slide-outs makes the surfaces incredibly slick. Users report that this slickness sometimes prevents the rubber wiper seals from "flipping" correctly , which can lead to leaks and seal damage. While we have not heard this from everyone, we do suggest you consider not waxing the slideouts on your RV. Decal Buildup: Some older or porous decals can absorb wax, causing a cloudy, milky-white buildup in the pores over several applications. You may want to test an area before waxing these . Environmental Limitations: You cannot apply wax in direct sunlight or on a hot surface, as it will cure too quickly, bake onto the finish, and become a nightmare to buff off. Better Alternatives to Wax For RVs with gel-coat or fiberglass surfaces, modern synthetic products are generally preferred over traditional carnauba wax. Polymer Sealants: Products marketed as synthetic waxes (like polymer paint sealants) chemically bond to the surface rather than just sitting on top, providing 4 to 6 months of durability. They are typically easier to apply and buff off than natural wax. Ceramic Coatings: Liquid polymers create a much harder, slicker bond to the clear coat or gel-coat than traditional wax. According to industry consensus, ceramic coatings offer superior UV rejection and can last anywhere from 1 to 5 years, greatly cutting down on maintenance time between washes. See more information on ceramic coatings, here . Regardless of the coating you select, focus on the most vital factors: safety for surfaces, the environment, and people. Consider the efficiency of the cleaning process, evaluating the tools, products, time, and energy required. You can find safe, effective options like Gabe’s Pride RV Streaker Deep Cleaning Concentrate that simplify the entire process.  In a recent blog, we discussed How Your Cleaner Should Affect Your Wax Layer . In this, we covered effective and ineffective cleaners and how they should interact with your wax layer. In our opinion a good cleaner DOES strip away a layer of wax. By the same token, it WILL NOT affect or damage a healthy finish. If the cleaner you’re using doesn’t meet those 2 criteria, please check out our Eco Friendly products. Ditch the Elbow Grease One of the things I LOVE about the RV community is the desire to help. Most of those you meet are more than happy to lend a hand to someone in need. And since we all know that the act of driving a living space across states can “rattle a few things”, we know there’s some effort in the RV Lifestyle. So, accepting that some things just require physical effort is fine. But if doing a better job means letting the tools do the work for you, that's not being “lazy”, that’s working-smart! When it comes to cleaning your RV exterior, if you’re using “elbow grease” that means your cleaner isn’t doing the job. See our customer testimonials here . Gabe’s Pride Streaker will help you with that chore and you won’t regret that choice. Our products are easy on you and mother-Earth, too. Real People Produced and manufactured in the USA, Gabe’s Pride is a family-owned company . We focus on producing top-quality cleaners that are Eco-Friendly. So when you have questions, you can contact us here .
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At Gabe’s Pride , we really enjoy our peeps in the RV community! Because we appreciate independence and time on the road, our conversations about cleaning needs cover a lot of ground. We’re thankful for our regular customers! And we appreciate the questions and specific cleaning challenges you bring us at Gabe’s Pride. While we ARE RV and home cleaning experts, gray tanks require a particular knack. That’s why we reached out to the team at Kleen Tank . We urge you to keep in mind that cleaning your gray tank demands time, care and most of all, safety. Why Does the Gray Tank Stink? Believe it or not, gray tanks can have worse odors and be more of a health risk than black tanks – especially galley grays. While black tanks are collecting urine, feces, water, cleaning materials and whatever didn’t “agree with you” last night, gray tanks get everything else. Laundry, Dishes & Heat. Oh My! Germs, bacteria and mold. All three are living things and all three require something from their environment to thrive. Those are: Food Water Heat Shelter  Unfortunately, we can find all of those in your RV’s gray tank. Food particles and a warm, moist environment inside your gray tank make this a perfect breeding ground for germs, bacteria and mold. Most people don’t think about Mold As we discussed in a previous blog, when cleaning your black , the most important ingredient is water! Mold can be trouble enough on its own. However, when mold gets dried out, it can become airborne. Once inhaled, mold can wreak all manner of havoc on your health . Headaches, congestion, cough, and many other symptoms are associated with exposure to mold spores. So what do you do? Because gray tanks generally don’t come with an on-board sprayer, using a reverse flush device is the best way for an RV owner to get extra water into that tank to help flush out food particulates. You may also consider using a water meter to prevent tank overflow. It's important to test the water meter before each use to make sure it's working correctly. To use or not to use an additive. Tank cleaning companies such as Kleen Tank do recommend using additives for cleaning your gray tank. Traditionally they use a Calgon base solution. This is used to coat the sides and prevent waste from sticking. The Kleen Tank team says “use plenty of water” to keep things liquid and moving both before and during the cleaning process. Should you choose to use a tank treatment product, consistency is important. Product formulations may be similar but are not identical. For this reason, frequently changing these may create a chemical reaction. Be careful and always read the instructions and use the product accordingly. When you’re looking for cleaning tips and tools for your RV or home, check us out our products and blogs . Since we’re part of the RV community ourselves, you may see us during this season’s rallies. Our Eco-Friendly cleaning materials are made right here in the USA. And we’re always happy to answer your home and RV cleaning questions. If you have a question that can’t wait, contact us here !
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