I just take it to the car wash, and use the high pressure soap. Spray it from just a few inches away, and they always come clean. I used to use Wesley's till I saw what it did to clear coat...
Daily: '19 Frontier 4WD Belle: '67 Belvedere Convertible, 318/727 in Go ManGo! Other: '64 C10, 283/3 on the tree