I have been maintaining this BMW 135i since Sept of last year. The mats always felt sticky to me when I would vacuum. I did a full detail on the car this week. I vacuumed the mats and tried to extract using pure water with my HP60. I could still see the soap in the mats. I then pressure washed them, WOW! Followed up with my extractor, dried overnight with a fan. Then applied 303 high tech fabric guard.