So, never really paid much attention; get 'em dirty, dunk a netted sponge/squeegee-on-a-stick in some Meguiar's and clean it up. Looking to get more serious now and wondering what the Brain Trust recommends. Came across this video (he has another for interior glass) but wonder what kind of wax is best for windows that will see real crud--carnauba, synthetic, mix, what?