justphong, it sounds like you might have hard water. Spots can also happen when you wash you car if you leave the soap/water for too long. You need to be sure to rinse and dry well in a short period. Of course waxing after the spots are there just protects them. I would suggest pain-cleaning clay or as white 330ci mentioned a pre-wax prep cleaner. Clay is really the best, it removes all the contaminants and ensures a smooth surface to polish and wax.
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