I've been using a water softener for over 20 years and never had an issue with the salt causing any damage to the cars, and on the plus side I don't get any water spots from the hard well water.
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I just got my bottle of this and I'm impressed, it cleans and leaves a nice matte finish, I'm definitely going to order a gallon.
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I cleaned the ones in my wife's old Altima with a brush and apc then sprayed off with my power washer. After they dried I put 303 fabric guard on them which helped quite a bit.
I applied opticoat 2.0 a few years ago when the temp was in the high 40's low 50's and it didn't seem to cure correctly would still smear after 4 days, so I'd wait until it's warmer or you can apply and let cure in a heated garage.