Wonder where the yellow went?

If you have old plastic-cased computers/monitors/printers/cassette recorders/etc. that used to be white and now are some drenched yellow color, this detailed solution may be for you. If you are in the U.S., like I am, you will have to find the appropriate similar products. But the fellow gives enough details that it does not sound like it will be too difficult to do so.

If you find U.S. products, please comment, so any future readers will know what worked.