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Well.. i use this paint prep degreaser type stuff i found at the outparts store to give it a quick wipe. If the weather is hot you can just use a hose.

For like the A pillar and stuff if you "really" want to blast that you need to blow out as much of the sand as you can when you are done. I personally will just paint some por15 or coroloss in there and keep the sand out of my car as much as possible.
 
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