I found this article some years ago and have now tested it on several Bernina machines with great success. Bernina's are very prone to yellowing on the back side and ends.
I'm attaching it to help others grappling with this issue.
The article is technical, but pursue reading, because the author goes onto describe it all in layman's terms using commonly available materials from the grocery store and the beauty supply store.
Hope this helps.
Good Luck,
Michael
De-Yellowing_Plastic.pdf
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