Even though I thoroughly clean my countertops and always use cutting boards, after three years they were looking dull and scratched to me. I did some research on line and folks suggested using Countertop cleaner by Magic
http://www.amazon.com/Magic-Countertop-Aerosol-Cleaner-Ounce/dp/B00827WDAI/ref=sr_1_1?ie=UTF8&qid=1429220996&sr=8-1&keywords=countertop+magic+cleaner.
I found a can for $6.00 at a store in Shipshewana, IN and thought I'd give it a try. What an amazing job it did. They look and feel brand new.
I bought some Scotch Brite non scratch scour pads, and gave them a light rubbing with that, I then sprayed the countertop cleaner on them and immediately wiped it off, buffing very lightly. I am very,very pleased with the way they look and feel. As I mentioned before they look and feel brand new.
Sue
