I rinse all my gear down, but only to get the salt off... I don't worry about the slime, but my car reeks of a combination of waders/drytop and fish slime. Like all odors, you eventually get used to it, but everytime I get into my car after a night of fishing its like "wow"
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My wife hates taking my car and she even recommended that I buy a little truck. If I only had some spare money that would be a great idea.