Swedishfish, I haven't seen this recommended here yet and I'm not 100% sure it works, but I have read threads where people would place the wet (but blown out) carto's in a sock, tie a knot in it and double the open end over the bundle with the carto's for extra padding then chuck them in the dryer with a load of laundry.
I have a little bundle in my dryer now but I don't know how well it works. I honestly don't care for carto's unless I'm going on a long drive and don't want to fool with pulling over to refill my carts or fumbling to attach another to my atty.
I would love to know how this worked!