Sanger 215 rear seat upholstery?
 

I've got an 06 215. I have finally started to clean up the upholstery which had a lot of ingrained dirt and a few bacteria stains from the 7 weeks shipping wrapped in shrink wrap. Everything was coming up great until I got to the rear seat lower. I don't know whats going on here as it looks like it has been sprayed with a paint like product. I'm not sure if its perished or whether someone has used an inappropriate product on it? I'd take a pic but I doubt it will show up enough to post. Anyone else come across anything like this? It just looked dirty until I started cleaning.

My 06 doesn't have that. Sorry I couldn't help

If you are talking about the contact area between the back seat and the vertical portion of the back seat, I do have discoloration there too. It is hidden so I dont worry about it much. But, I have tried to clean it off with many different products, and it wont come 100% clean.

I mean the whole seat base is discolored.