Hoffmanns Vanish Teppich-Spray -
hereDo a patch test first to check that the seats can be washed at all though.
If you are doing the carpets as well (though a sprinkle of baking soda and a good vaccuum will do the job in most cases), then their Kraft-Schaum is very good.
For the cockpit, most household spray cleaners will do (even Pledge) but remember to spray the cloth and then wipe, not spraying directly (over-wetting can be a real problem).