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You have received a lot of great suggestions from the forum group. I also endorse the use of the Zep product as recommended (in both the gray and black tanks) in post #3. I also have had to replace the air admittance clapper under the sink. The vent openings on the roof have tops, that were other parts I replaced as a holistic approach to smell control. I also add Dawn dish soap to shower, kitchen, bath lav drains with each tank draining along with the zep product. One thing not mentioned in the original post was the model toilet installed in the problem camper. Thetford has long been known to leak waste product internally and emit foul odors. If you have a Thetford, consider replacing it. One last suggestion to consider is, what things when used in the camper, create a negative pressure which can draw odors back into the camper past the air admittance valve, the toilet valve if not sealing, the HepO valve (If you have one that is defective). Things like a Fantastic fans in the kitchen or bathroom, kitchen hood vent, windows open on the lee side of the camper when windy outside, or leaks in ac ducts, create a negative pressure. How does an ac duct leak cause a negative pressure (suction) to occur? Any air that escapes on the pressure side ducting into the attic space, causes an ingress of an equal amount of air from any number of places, to enter the camper anytime the ac fan is drawing air into the return. I would suggest you consider doing all the many ideas given in this thread, as well as keep doing the great job described in post #1. Not directly related to the smell problem, that has happened this past year was a slow drain of shower water. A leaf blower was used to easily restore active draining. Once cleared, adding Dawn soap into the drain, then another application of pressurized air from the leaf blower into the drain, worked magic.
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