I might go with leftover smelling but go a different way to clear the question. I never feel we get the tank spotless, so just go with adding chemical of choice after dumping.
As an added thought, why does the smell get inside? Normally keeping a bit of water in the stool is what forms the trap to keep odors out, so you have that covered but is the smell coming back in from the roof vent stack or how doe it get back inside?
Any chance it is a smell from the grey water tank and getting back in through a shower, vanity, etc which does not have water in the trap or perhaps there is and airgap gizmo up under a sink which is not noticed but not closing well enough to keep smell out? ?
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Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one!
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