Camco TST® Enzyme RV Toilet Treatment 64 fl. oz. Bottle

This is the best RV toilet "chemical" - mostly because it is not really a "chemical"! It contains enzymes that help break everything down that causes the smell. Most other "toilet chemicals" are actually just deodorizers that try to cover up the smell rather than really take care of it. We also put a little in the kitchen gray water tank - really helps with the smell in that too! My only issue is that WalMart sells three or four of these other types in the store (the green and orange ones) but I have to order this one online because they no longer stock it in the store. Pretty sad because this (blue one!) is the best one. Please consider killing one of the other smell-good ones and replace it with this one with enzymes!!! PS - We really like having the liquid instead of the tablets because you can put a little or a lot - depending on volume of your tank and/or temperature outside. It ends up being more economical.