I've cured loads of stinky or stained seats, what you do is
1: Remove seat
2: Run hose through it for 20 mins
3: Leave to dry (Conservatory or green house)
4: Re-fit seat
Next week, footprints on roof linings.

Just have to check all the airbag connections to make sure the seat doesn't inflate when we take it out and float away in the breeze.