There is a treatment for that that involves like baking soda and aluminum foil and UV light. I think it’s called retrobrite. Might be worth looking into but at the same time if you’re going to do that you might have other repairs you would need to make on the machine.
Peroxide, heat, and UV light makes for a good combination.
But it’s not without risk, such as streaking or over-lightening. It also isn’t a permanent solution, but should buy you a good additional handful of years if the console is stored under optimal conditions.
I have used retrobriting on a few consoles, with decent results. I restored the plastic on a model 2 Japanese Sega Saturn this way, and it turned out gorgeous.
imo it’s not really worth it unless you really need to make it look new… the chemicals are toxic and plastic will get weaker as well.
