I've had my liner on for about 2 years, and it doesn't seem to cause any problems. It is pretty easy to clean with window cleaner, and doesn't get all that dirty to begin with. The only thing I have trouble with are the screws vibrating out, try using loctite on the screws when you install the panel. Also, if you have a strut bar, check for clearance, mine has a couple of rub marks on it from the strut bar.
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