I have a new Mission and Plague and i bowl at a place that leaves nasty belt marks and grime... for years ive used rubbing alcohol to get the marks off then clean it with powerhouse energizer cleaner.... but now people are telling me that rubbing alcohol messes with the coverstock.  I have used this method for years and i never noticed anything really. But if this is true is there a different way i could go about getting those nasty marks off with some household products?  Thanks!