Update: Now Clean, But...
OK, so I put the seat covers in the washer with OxiClean, and the fronts look great aside from some sun fading. I don't see any of the spots and stains, but somehow the backing did not like the OxiClean.
Again, the fronts are good, the backs only look ugly. I bought a new set and they are just nylon. These are much older and seamed to have a protective film that was on the backside of the nylon covers.
The picture in the middle is the reveres/backside. I just took the pictures and they are still wet so they look a little more discolored. Should look more uniform in color as per my first pictures, less the spots/stains of course. Installed you can not tell.
1995 NAS Defender 90 AA Yellow #2986: Current
2009 Range Rover Supercharged Black/Black: Current
1993 NAS Defender 110 #375/500: Sold
1995 NAS Defender 90 Soft Top Beluga Black #2556: Sold
1991 Range Rover Hunter Green: Sold
1997 NAS Defender 90 Station Wagon Portofino Red #128: Sold
1993 NAS Defender 110 Beluga Black #215/500: sold