I bought a JD317 last summer and the seat was solid but full of grey overspray. Little dots of paint all over it. I'm not sure what this paint was, perhaps a primer, but it did not want to come off with a simple wash. This winter I have been going at the 317 restoration one piece at a time and decided to tackle the seat. I tried lots of mild cleaners but nothing seemed to even loosen it. I tried scraping each little dot off with a box cutter blade and that worked but was super slow and scratched the seat.
Heres some pics of what it looked like.
I didn't want to use anything like acetone as I knew that would melt the seat. I tried paint thinner and car upholstery cleaner but nothing really helped. I thought I'd try abrading it off with rubbing compound. That seemed to help but was very slow. OK, GoJo hand cleaner. That seemed a bit faster so I got a random orbit sander, put a micro fibre cloth over the base and started "rubbing out" the seat using lots of hand cleaner. It worked and took about an hour or so to clean 99% of the paint off the seat. There are still a few specks here and there but overall this technique worked well. It dulled the surface a bit but I can probably polish it back to a better gloss if I want. It looks much better now and I am impressed at the quality of these seats. I'm not sure it is the original, but it's a JD seat and I really wanted to save it if I could.