I have done this before and the only advice i can give is this....... These seats are at the least 22 yrs old and when they go through the washing machine sometimes the foam between the outer material and inner material can disintergrate causing them to lift away making them wrinkle. I have been lucky sometimes but i have also been unlucky. Good luck if you decide to strip and machine wash...... Personally i would do as others have said and vax em