Our products use sponge as vacuum suction product, the product has high temperature (about 100 degrees), one suction and one release, only contact for two to three seconds, sponge will leave indelible traces on the surface of the product after absorption. Any sponges that leave no trace? Or is there any process to solve this problem? For example, foam good sponge for liquid medicine immersion, or high temperature baking to remove impurities? Avoid sponge residue on the product?