If you don't mind putting a few coats of elbow grease into your sled, I did this this year for the first time and was impressed... had the same scratch and rub marks, pulled them right out. Go to Pep Boys (only place that sells it around here), and get the mothers three step process ( Pre wax, glaze) they are two separate bottles... there is a third, the liquid carnauba wax, but it wears away too quick. do the pre wax to pull any crap off after you use a good dish washing liquid to pull any last wax off (gotta start fresh). Make sure the sled is GOOD and DRY before you pre wax tho.... (i.e. have a beer watchin football or something first) LOL... pre wax it, buff that off.... do the glaze, and when you buff that off, it will look done, but you need a good hard paste wax to protect that glaze other wise it will wear off right away. I found the best wax was Collinite paste wax.... I'm spoiled tho, they manufacture it here in Utica, NY. If you can find it, get it, if not, any hard carnauba paste wax will do... then, from that point, if you get any, simply put a light coat of the glaze and the wax again, and GONE....
But I agree the preventative maintenance of a towel or a soft cover helps a lot too...
GOOD LUCK!!!!