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Patent Pending If a stain has "set", it has become chemically bonded to the material that it has stained, and cannot be removed without damaging the material itself. It is therefore important to avoid setting stains that one wants to remove. This can be done by avoiding heat (by not pressing or ironing the stain), sponging stained materials as quickly as possible, using the correct solvent (some solvents will act as catalysts on certain substances and cause the stain to set more quickly), and avoiding rubbing the stain.
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