Best RV holding tank treatment

[dkkelley44]

Calgon and Dawn

My wife and I recently started using Calgon water softener and regular blue dawn dish soap. So far, it seems to have knocked the smell right out.

[Smokeater]

Similar to above if it needs to soak and clean with the borax and dawn. Then the calgon water softener and downy fabric softener. I also use a wand that I made for cleaning the black tank. It shoots straight down and to the side. I want to know everything is out!lol Also keeps the sensors clean and tilting it back and forth gets the underside of the tank rinsed off.

[RSW0913]

happy camper

[CWendling]

agree with happy camper. I often leave my tank a couple weeks at a time, even in this 100+ heat and its fine