you can do vacuum before or after water but its best after so when rolling the cover from back to front you vacuum that roll/fold and the as your reverse roll it the clean outer touches the clean inner,
For maintenance on my cover and not cross contaminating the dirt from outside to the inside of cover, i blow off the dirt with a blower before accessing the inside of boat each day of usage before rolling the cover forwards . I tow with it and store the clean cover in my truck cabin, rarely does the cover get dirty toeing because of the flapping at speed just like the blower In driveway.
If
Kept up like this , when boat is in the rain covered, the rain cleans the cover completely except mildew stains from open side of my carport storage
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