You can try this on a small scale first to see if it works: Pour some hydrogen peroxide on a spot and cover with plastic wrap. Let sit for 24 hours then lift the plastic and wipe up the peroxide. If it works on small spot the way you want it to, you can continue with the rest of the counter.
The way I found to remove yellowing is going down to Sally's get a large 20-50 vol developer (peroxide) I like to get the cream but the clear works great to spray so either also get a bleaching powder to activate or you can just mix it with baking soda, wear gloves! Works fast and on just about any hard or soft surface that has any type of stain including carpets and sofas! The best part is it is cheap!
We bought our home in Nov. 2013 and I noticed in the sunroom (built on the back patio slab) that the North window had this plastic (very thin) stuck on it. It's as if...
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Elizabeth did the hydrogen peroxide work? I just saw where police nt or alka seltzer was also suggested.
The way I found to remove yellowing is going down to Sally's get a large 20-50 vol developer (peroxide) I like to get the cream but the clear works great to spray so either also get a bleaching powder to activate or you can just mix it with baking soda, wear gloves! Works fast and on just about any hard or soft surface that has any type of stain including carpets and sofas! The best part is it is cheap!