by Shadow Catcher » Wed Jul 20, 2011 7:37 am
Bleach will kill bacteria etc. but will do little for dirt or grease. Buy a brush, and I am thinking of a round brush used for cobwebs with a long handle use dish soap and scrub the heck out of it. Commercial RV tank cleaner is meant more for sanitizing rather than cleaning. I was originally thinking of using a Scotch Brite pad but in general I think you want to avoid scratching the inside of the PVC as much as possible.