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inferior liners have been known to turn chalky. our chemicals come from BASF. when you pay for Line-X you do pay a little more, but the quality of our chemical is well worth it. BASF is a global leader in chemicals and chemical technology. Beds do tend to hold soap more than the side of the truck just because its a relatively flat surface, and the chemicals dry on it if not washed off properly. a good degreaser like simple green and a brush, then rinse with a good powerwasher should take care of the residue if it is just soap.