I had to remove the floor liner and the sound deadening putty under it due to Hurricane Harvey flood damage. The Harvey flood water had a good dose of sewage in it. Eight + weeks after driving through headlight deep water my FJ was funkadelic. The putty can be softened with a 50% solution of Simple Green. It turns the dense crystalline putty under the factory paint to a paste. Removal is still tedious but the paste consistency is much easier to remove than the dry crystalline residue.