Take them off and bring them in the house to warm up for a day. Use plenty of Dawn dish soap and a soft bristle brush to clean them, Dawn will get rid of all the grease, oil, etc. Dry them off. I used some rubbing alcohol and wiped them down to make sure everything is really really clean. I used 3M molding tape to stick mine on.
Did you remove the original stick tape (looks like insufficient coverage across the back of the aluminum sills) that was attached to the sills?
If so, did you put on wider & longer pieces of the 3M tape?
I've never installed mine because I read stories of them coming "un-stuck" and falling off in parking lots.
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So how are they attached to the car? is it double sided tape, or sometype of clip that you can disengage???
What Jim said...by take them off he means the OEM plastic ones now on the car, they will pull right off; so that both original and new pieces are warm. Dennis
Pictures anyone?
I got mine 2nd hand. Yes, I did have to remove the original tape. Goof Off works wonders. I use 3M molding tape and completely covered the back of the sills. If you do that AND follow my instructions to clean the factory sills you shouldn't have a problem.
If you need additional tape you can get the wider stuff at Kmart.