I know the roof has special UV filters in it. These do not need to be an outer coating, they can be part of the glass. But we also know how the Tesla roof beads water... this is interesting 1. Does the Tesla roof have a special coating on it? 2. Does the Tesla roof require any special care? Should I avoid harsher glass cleaners (say those for removing water spots)? 3. Does the water beading effect ever diminish over the years?