just move them about so you can get to each part, and start from the headrest and work your way down the seat.also if the seats are really manky give them a pre-spray with some highly diluted apc which will loosen the crap and make it easier to extract from the fabric. when i say pre-spray im mean literally mist the seat so it dampens it slightly, dont soak them. also get some zoflora and add a capfull to the tank, this will eliminate any nastys in the fabric and will keep your car smelling fresh while its drying out.