if the trim is stainless or alum... yes you can sand/scuff it down to a satin finish. some oem alum trim is clear annodized(sp), oven cleaner will strip the clear annodizing if needed.
take the bumpers to a chrome shop and have them stripped. you "can" grind it off, but its not worth the effort. my local shop charges about $20/bumper to strip them of the plating.
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