Said that I would post a pic of my yellowed Taxi topper after I whitened it up. Well, after trying out 3 different methods, here it is.
Process: My first attempt was a heavily concentrated bleach, OxyClean, and corn starch as a thickener, which I let sit in the sun for the day this summer. I did 3 applications of this method and had minimal results. Decided it would cost a fortune in concentrated bleach at the beauty supply store, so I abandoned. I then tried acetone, which removed some of the yellow, but not enough and was roughing up the finish. Third time was a charm: I found that Krylon made a plastics spray paint and primer. Even though the paint said no primer needed, I used 600 grit sandpaper on the topper first, layed down a few coats of primer, and then painted white with 2 coats. You can see a little area at the top left that looks rigid. I left the topper in my garage to dry after the first coat and came back to put the second coat on the next day. I didn't notice that a spider had laid down some webbing on the topper in between coats....will note next time, lesson learned. Didn't look bad enough to redo and it's out of site, so being my machine, I'm not too concerned.
topper.JPG