If your tanks were drained and flushed prior to winter snows there really shouldn't be any smell, with that said you are correct getting snow away form the vents allow for airflow.
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Retired Navy
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho
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