I've used Woolite and a Wet or Dry Vacuum cleaner to get almost everything out of carpets and upholstery.
soap
there are two bolts in the back of the seat. remove them and then slide the seat back about an inch and remove
To remove the back seat of a 1998 Toyota Corolla, you will need to remove the carpet to expose the bolts for the seat. Then, loosen the bolts by removing the nuts. You can then remove the seat.
On newer models, you have to move the seat all the way forward, remove side trim cover, remove seat belt anchor bolt, remove seat rails retaining bolts, tilt seat upward, disconnect wires, remove seat...
you must remove the bolt behind the rear seat and remove the rear seat then you will see 2 small Allen head bolts remove them and the seat will come right off.
The bolts are visible at the base of the seat. Remove them and lift out the seat.
Move seat fully forward, remove side trim, remove seat belt retaining bolt, remove seat tracks rear bolts, flip seat upwards, disconnect wiring, remove seat.....
The rear seat is not designed to be removed. You can remove the center seat and slide the rear seat forward.
how to remove 2004 scion back seat
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To remove the back seat of a Skylark, reach into the area between the back and the seat and pull up on the seat. The back part of the seat is bolted in and will require a socket wrench to remove.
Remove the 10mm bolt from behing the rear seat. Then pull the rear seat it hooks to the front seat in the front. Remove the bracket there and pull the front.