ok i did it to my g2 (old car) but if it like shrinks the fabric of your seats then its not my fault because i didnt use hot water and when you do it make sure to keep your windows down as much as possible so it doesnt stink your car up and for mildew and stuff like that. i didnt have any kinda problem like that with it but if you go into a store just crack your windows and that sort of thing. make sure to get as much water out with the vacuum as you can. if you dont really want to do that then you might want to try some hair spray on those pen marks and if that doesnt do it then go to walmart and get some upholstery cleaner and make sure it has a guarentee that it will take it out so if it doesnt work then just send the un used portion back and get your money for it
any how that is just my 2 cents
steven