I think any scratching is going to be caused by particles under the cover, not on top of the cover. I think you'd be ok if you wash it prior to storage then put the cover on. I wouldn't put it on / take it off daily.
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2010 E93 335i M LeMans Blue
2001 E 46 330ci Coupe/silver/black/Sunroof
1999 BMW R1200C Cruiser-Ivory & Blue
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