hp 28s yellowed keys.

[Rafa]

(05-31-2024 10:51 PM)Dave Frederickson Wrote:  

(05-30-2024 06:39 AM)Rafa Wrote:  Is there a safe way to brighten up the keys and restore them to their original tint without having to dismantle the calculator?

A safe, easy thing to try is a Mr. Clean Magic Eraser or melamine sponge. No chemicals or disassembly required. My results varied.

i think this one works by shaving a bit of the surface that is stained. Also the surface here is not flat for a solution like a melamine foam.
thanks for the tip, though