ive always just used the basic tint available for 20 years. INcluding my model S. Charcoal color, 35%. ONly clean with damp microfiber. No chemicals, no Windex.
Ive never had bubbling, purpling, peeling. Never had a need for the up priced versions that claim to reduce heat, blah blah blah. If my car has been sitting in the sun, no tint is going to prevent the need for using AC. Not even high priced ceramic. So whats the point?