Old dog here not to familiar with all the new chemistry out there. Just used McKees soap m437-690, and coated with Sio Coating M37-630. Ended up with water spots, probably because I started on the roof top and hosed off below ! Hood ended up with lots of spots. In the past I used general car wash stuff and a professional simple spray and wipe stuff. That was great for a year easy. Have to get the name, but not over the counter sold to my knowledge. Mean while my Mckees stuff shines nice, but rain water beads up like one inch puddles all over, just does not run off ? So started this thread for all to compare notes. Drift I get is, a nano bond hydro/ simply spray and wash type finish (3-4 months), or a polish wax coat applied and buffed (6 months), to final ceramic finish coat applied (1 year) ? Thanks.