So my 98 came with the OEM rubber cargo liner and it's had this weird grey/white stain on it that k
eeps coming back. I've tried cleaning it with a dawn dish soap/water mixture, degreaser, rubbing alcohol, and straight water but it slowly returns after a few hours and in a few days it's back almost as bad as it was originally. The mat is better than it was when I first got the vehicle but the stain still remains and it does leave marks in the carpet and the only way to get it out of the carpet is to shampoo it again.