Before I even think about rubbing something on my car I usually:
Rinse with a pressure washer, then switch the nozzle to soap and spray the car and let it soak, high pressure rinse, then soap soak again, and high pressure rinse again.
Then I go around the car above the belt line with a shaggy sponge, rinsing often and carry lots of soapy water in the sponge, then repeat below the belt line.
Then a final high pressure rinse.
After that the other day I felt like giving it some more love so I went over it with a clay bar, then dupont teflon wax and a final microfiber buff by hand.
>>4965