We took the cover and the harness and everything off and put it in the washing machine, then hosed off the actual base. It does take a fair while to dry, though. Fortunately, each time it's happened, we have been places where we haven't had to drive for a day or so afterwards.

The first time, we got the febreeze happening as well, because there was a ghost smell.

Hmmm, wonders if the people who bought the old car still get waft of baby spew every now and then, when it's hot?