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Be careful how you blow air in there. You don't want to cause the fiberglass to bulge and separate from the foam. When you clean out the screw hole its best to drill it just to clean it up. I have used those epoxy syringes to inject acetone in the hole. It will mix with any water around the hole and evaporate quickly. If you would rather use compressed air, go to an office supply and get one if those cans of compressed air they use to clean keyboards. Much less pressure.