I really shouldn't give the boys food in the car, really I shouldn't....  or I should at least remember to clean the car and their seats out more regularly, something....   

So, the seats are revolting    Am washing the covers, have vacuumed out the seats, but the foam and the polystyrene, especially on the MaxiRider (the Royale isn't so bad) are just filthy...  if I can't manage to get them clean (I'm about to try now while the cover is being washed), is it possible to just get new bits of foam for under his bum, and the polystyrene that is in the bottom of the seat where the straps come out?  the stuff up by his head is ok, just the bottom where all this crap has accumulated is pretty gross!