Yes, clean it first. I use Turtle Wax F21 twice a year on the seals, once in spring, once when putting it to bed for the winter. We had our previous hybrid for 10 years and the bed seals were like new when we traded it.
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Chuck
2013 Jayco Jayfeather X20 E (sold)
2016 Chevy Silverado LTZ 2 Z71 Crew Cab (sold, and dearly missed)
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