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Your cart is empty.Ever experience false readings from sensors or a continuous odor coming from a black holding tank? If so, most likely there is residual waste build-up on the holding tank interior walls that have dried and caked on the surface wall. Using COMMANDO Black Holding Tank cleaner removes odors and sensor build-up in as little as 12 hours! It's made from a super-concentrated scientifically developed formula that is filled with natural enzymes to penetrate the walls and sensors to break down waste and paper build up in black holding tanks. Not only does COMMANDO Black Tank Cleaner work to clean your holding tank and remove odors, it's also used as a preventative treatment to keep holding tanks healthy and in good working condition. This product is perfect for consumers and for dealers who need to clean holding tanks and remove odors in rentals or sales of used units.
Mike
Reviewed in the United States on June 1, 2025
Works great when used per directions.
mindnmatter
Reviewed in the United States on May 5, 2025
Worked!
Wmatkinson
Reviewed in the United States on May 31, 2025
Busts up hard chunks. Soak 24 hrs in FULL tank. Best if used after dumping. Refill with water and treatment
Sam lambert
Reviewed in the United States on May 25, 2025
I bought a Rv that sat for 10 years without use. The black tank was full. I did flush tank a few times but was having problems with the sensor. I tried different brands but truthfully i am amazed and will definitely will be a repeat customer. I let the tank set for a weak going by directions and i am extremely satisfied with this product. My sensor now work right and i can confidently flush my black tank knowing its empty and clean correctly
Julie M
Reviewed in the United States on May 2, 2025
Love this stuff
Charles Rogers
Reviewed in the United States on April 9, 2025
We had a tank sensor stuck on full. Used these and filled the tank. Drove around a little and drained the tank. God as New these work fantastic Highly recommend them
M. Durand
Reviewed in the United States on April 29, 2025
Smells nice. We left it in our tanks for a week. It seemed to help some but we still had to use the toilet wand to effectively clean the tanks out.
Customer
Reviewed in Canada on April 17, 2025
Worked great
ABsamp
Reviewed in Canada on July 25, 2024
Smell good but after following all the instructions there was no change in my bad sensor reading so did not serve that purpose.
Cheryl Arnold
Reviewed in the United States on July 13, 2024
Works good
Good
Reviewed in Saudi Arabia on June 11, 2024
is what it means
MISSCDN
Reviewed in Canada on August 29, 2023
Despite using tank cleaning drop-ins regularly and using the tank flush, we would consistently a 1/3 full reading immediately after emptying. We dropped one of these into the tank, filled per instructions and let the solution sit for approximately 12 hours. Emptied and tank flushed again and after a moment or two, the tank indicated as empty so it worked perfectly! The only think I wish is that these RV necessities would be less costly - on a cost per use basis, we are paying just over $4 per drop-in (after tax). True, you shouldn't need to use them very often but that's still a lot. They do work though, so I guess my mindset should be that you get what you pay for.
PJ
Reviewed in Canada on November 13, 2023
I used this in a clogged RV black tank/pipe situation. The RV was ten years old so it had been used lots before it ever clogged up. I had to have two tries with Commando, with only a couple days in-between, before I got the results I was hoping for. Follow label directions closely! I have not had any problems since - 137 nights over almost a year. Picked some Commando up from Amazon to have on hand - great price from the Amazon vendor.
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