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Years ago when laquer paints were used and sprayed dull and you had to use a heavy compound to create a shine you had a great deal of 600 to 800 grit residue left on the finish and if you were using a light compound and a polish to continue to create a high shine the practice was to wash the car off before moving to a lighter compound or polish.
With today's polyurethane enamels that spray shiny and today's clear-coats that do not require such aggressive compounds there is no need to pressure wash the car before polishing and/or waxing or sealing.
At least this is how we have detailed and trained people to detail for the past 28 years and have had no problems.
It doesn't matter if I compound and/or do a light polishing. I still blast out all the polishing residue out of the areas that my hand/towel won't ever reach. There's no way of taping off every crack, crevises and body line that your buffing pad glides over/across. The products I use are water based and easiy get removed with my PW'r. There's nothing that looks more incompetent than seeing dried white residue all over a vehicle.