Some yellowed stains are due to deterioration of the plastic as it ages. Some are due to light exposure. Some are due to being under something too long. Not much to do other than hope exposing it they will even out the color.
The previous owners had kept their dogs in this room and allowed them to relieve themselves all over the carpet. When I took up the carpet the carpet pad left these ...
See more
Try coconut oil or mayonaise. Wipe on wipe off.
Vinegar...here's a link with details:
http://www.howtocleanstuff.net/how-to-remove-stains-from-cultured-marble/
Some yellowed stains are due to deterioration of the plastic as it ages. Some are due to light exposure. Some are due to being under something too long. Not much to do other than hope exposing it they will even out the color.
None of these things worked in my yellow stain: vinegar, Chlorox, peroxide, Comet.
I ended up taking 200 grit wet or dry sand paper and wet buffing the whole top down. Then I went over it with 1000 grit wet/dry.
The other alternative is to coat it with a plastic laminate coating system.
Good luck to you! I have listed some videos for you. Hope they are helpful!
https://www.bing.com/videos/search?q=How+to+remove+yellow+stains+from+cultured+marble%3f&qpvt=How+to+remove+yellow+stains+from+cultured+marble%3f&FORM=VDRE