So, how do I protect my seats?

If you have cloth seats, and there are not really any stains on them thus far, youll be surprised how far a good vacuum cleaning ON A REGULAR BASIS can make them look. Note the part in caps, that is very important. If you have leather seats, Meguiar's Gold Class Leather Conditioner works very well and also cleans the seats. There is also Lexol Leather Cleaner and Conditioner that works VERY well, and some swear by it like no other. Ive had no experience with it, so I cant give much more input. But you must vacuum beforehand or you may end up rubbing dirt into your seats thus making a stain.