I used shout actually but simple green works just as well.
Don't use too much or you will be sitting their forever removing the soap.
To remove the seat fabric it is easier than you think ,it takes all of about 4 minutes especially once the seats are out.
To remove it start at the back of the seat where the back and the seat meet, recling the back forward and their is a small fold of fabric , pull it up and the hogpins are held their .Now cut them off using a sheetmetal cutter or something of that caliber.
Slowly pull up the fabric once you remove the head rest and undo the screw for its retainer.There should be a few more hog pins to undo with springs holding the lumbar to the fabric .
That is it .
To reinstall use small zip ties instead of hogpins since they are much easier to get in and tighten.