Industrial Strength RV Tank Cleaner for Black & Gray Tanks
When regular treatments aren’t enough, Happy Campers Extreme RV Holding Tank Cleaner resets your system with a single, powerful deep clean. It dissolves stubborn sludge, restores tank sensors, and eliminates tough odors in both black and gray tanks.
Why Choose Our RV Tank Shock Treatment?
- Heavy-duty one-time treatment for deep cleaning
- Breaks down solid waste and sensor-clogging buildup
- Restores function to dirty tank sensors
- Compatible with black and gray holding tanks
- Safe for campground dump sites and RV plumbing
How to Use:
- Dump and thoroughly rinse your RV holding tank
- Mix entire container of Extreme Cleaner into 3–4 gallons of hot water in a bucket. Stir until fully dissolved
- Pour solution into the toilet (for black tank) or down the sink (for gray tank)
- Add 5–7 more gallons of water into the tank. If parked, fill tank completely if possible
- Drive your RV on winding or bumpy roads to agitate the tank and enhance cleaning
- Once you reach your destination, dump and rinse the tank thoroughly
Important Notes:
Agitation (via driving) and thorough rinsing are key to effectiveness — Extreme Cleaner loosens and dissolves sludge, but motion and water do the hard work. For non-mobile RVs, fill tank as full as possible and soak for 48–72 hours before dumping. Use a rinser for best results.
Sensor notice: While most sensors are restored with heavy cleaning, results can vary depending on buildup or probe condition. Product will not dissolve wipes or fix broken/corroded probes.
Looking for ongoing maintenance after a deep clean? Try our daily-use odor control treatments next.
This is NOT a regular maintenance treatment to control odor:
The Extreme Cleaner is designed to completely clean your holding tank when you know you've got a problem. If there is stubborn buildup, mold, or other disgusting gunk in your holding tanks, this will get it out.
We highly recommend that you watch what comes out of your holding tank even if you thought it was fairly clean — you'll be surprised.
Just take a look at these actual images shown above of an RV gray holding tank that appeared to be clean. The water was running clear before using the Extreme Cleaner treatment and WOW, look what came out.
The Extreme RV Holding Tank Cleaner is Easy to Use and Can Be Use for:
USES:
1) Thoroughly Clean holding tanks
2) Cleans poor working sensors.
3) Softens & removes solid buildup like poop pyramids.
4) You just bought your RV & want to super clean the tanks for a fresh start.
5) A great product for an annual clean out, especially when winterizing.
*Recommended for use in 30-60 gallon tanks.
Videos Hide Videos Show Videos
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We bought a used 2008 Diesel Pusher. Despite flushing and treating the black tank several times, there was a slight smell that we couldn't shake. Extreme tank cleaner was recommended on a Facebook Forum, so we gave it a try. We were exceptionally happy with the results, and NO MORE SMELLS. Happy Wife...Happy Camper! :-)
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Easy to use. Does an excellent job.
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Excellent
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As the 2nd owner of this 5th wheel, I never thought about the original owners not using the black water holding tank properly. While my camper was getting some TLC and refurbishing at a repair shop, I was informed my black water holding tank was full of solids....I was horrified, embarrassed and ashamed. Although I was not leaving the black water valve open, it occurred to me that maybe the previous owners were not aware of which valve was which. My dad informed me of this product, granted I've used it 2 times on 2 different moves from state to state, there is a major difference in water color when rinsing the tank, it's actually clear water today. I recommend this product to anyone who buys a used camper just to be safe. You never know what the previous owners did or didn't do.