Obviously, steam cleaning works best. The other marks and the greese stains should come out. Greese is hard no matter what. Steam cleaners don't do miracles, they just work a little better.
The best way other than that would be the method you already used. Try hitting it again, then make sure you wet vacuum as much out of the seats as you can.
I like the fact that you used Preen. LOL
I reckon if you hire a steam cleaner, at least you'll give it a go and know that you gave it the best shot...?
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