who
you've used clay to clean your car before, havent you matt?
The OP
Yeah ive clayed plenty of cars, its **** easy you just need a full day of good weather so you can clean, clay, clean, polish, seal and then wax it.
1) Dunno mate
2) Autogylm Super Resin Polish or for full effect after add 2 coats of Ultra deep shine (as 1 makes it look matted and worse imo).