For those of you that have weather tech floor mats, what's your go to method to keep them clean? I recently washed mine off with soap and water and it got most of the deep dirt out, but there is still some areas that look dirty. I then tired some armorall to try and shine them up. Didn't do too much. Then tried tire shine. It did a little better, but obviously a little slippery. After 2-3 days, they are now dull and no longer slippery, but the dirty areas are starting to show back up. Y'all got any tips/tricks??