Right, the upholstery cleaner isn't shifting much of the dirt and oil stains on my sparco seats, so should I put them in the bath and give them a good soaking with washing powder? I'll remove all the metal bracketry of course

I would just remove the fabric lining but its glued on to the seat with the padding so it can't be removed.
Yay/Nay?
Celica GT4 ST165 Sprint Special. GT3071@2.0bar