Yes, as "Old Farmer" says, put RV antifreeze (pink stuff) in the P-trap, to keep the trap from freezing & then put about a tablespoon of any cooking oil in the drain to keep the liquid from evaporating as fast. This will help hold back any odors from your gray tank. Do this to your bath & kitchen sinks too.
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Steve & Sharon
'13 Dodge Citadel (hers)
'12 3500 Dodge Mega Cab 6.7 Cummins (his)
'12 Crossroads Rushmore RF38FL (ours!)
Barry, the ADHD x 2 German Shepherd mix, Granddog.
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