Cultured Marble walls yellowed?




We religiously squeegee our shower /tub surround walls after showering. We don’t ever use any cleaner. They arev28 years old and I have recently noticed the corners and the walls close to tub have yellowed some of it is soap but not on the wall corners. Do you have any recommendations how to get the yellow out? Thank you

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Mix a ¼ cup baking soda, ¼ cup vinegar, ½ cup ammonia, 8 cups hot water. Let it foam up. Use a sponge and apply the mixture to the surface. Let it sit for a while. Rinse well. Reapply if needed. Wear gloves and open window.
Was not sure so I Googled and this is what I found for you.
https://cleaning.tips.net/T009377_Restoring_Yellowed_Cultured_Marble.html
https://homeguides.sfgate.com/can-cultured-marble-yellow-83877.html
https://www.hometalk.com/diy/clean/house/q-how-do-i-remove-yellowing-on-white-cultured-marble-counters-29410275
Hope it helps!
How do I remove yellowing on white cultured marble counters?
I googled it too but thought I like ideas I get from here...more real experience I figure. Thank you will try tonight.