brush off the crud first otherwise you just make mud. But when it comes to removing, if it doesn't need goo gone, then a magic eraser wetted down with 70%/99% IPO is best. Only thing that I've not been able to remove with that with ease so far is paint stick, and a few stickers (that's what goo gone is for).
And that cart is nothing compared to some I've cleaned. That doesn't look sticky or gooey or anything.