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		- Joined
 - 6 Jul 2008
 
- Posts
 - 1,841
 
They can do. If the car in front of you has a chunk of grit on it that gets stuck to the bristles/rollers then it's going to scratch every car that goes through it afterwards until the grit falls off or is removed.
Same could be said for the brush on the jetwash though.
	
 
 I use them on occasion and the first thing I clean is the brush... then I get started on the car!
 Within about 90 seconds my car looked and smelt like a giant marshmellow 