I store our motor home in our heated garage which happens to be under our master bedroom. We sleep all year long, about 3 feet away from our PC waste tank vent with a house floor in between. In an effort to eliminate any "potential" for RV sewer gas, at the end of every RV season, I pour one bottle of bleach down the RV drains & toilet, let sit an hour in the traps, then continue to fill up the waste tanks through the sinks, shower, and toilet until both tanks are full. I also run the mascerator pump briefly to get the diluted bleach solution in that system. Then I let it all sit around a half day, then drain both tanks into the ditch next to the driveway. This thoroughly cleans the tanks and mascerator system, elimiates sewer gas odor, and "I Hope" cleans off the waste tank sensors.BTW: The bleach also does a very nice job of cleaning the toilet bowl and trap door there. I fill the toilet bowl to near top with water and a little bleach, and let that soak too.
There are some bug based cleaners and enzymatic types that do a great job for end of year (winterizing) tank cleaning that pretty much take care of the sludge referred to in the original post.L. G.
....Peg put a cup of full-strength bleach in the bowl and it sat until the seal went.Somehow I can't be too hopeful the seal survived that.Did you get your recliner yet?