I used Bar Keeper's Friend to clean a stain on my Calacatta Valentin quartz countertop and the countertop is now discolored. It's not dull but the finish is darker and different from the rest of the countertop. Can anything be done to fix it?I now know not to use BKF on these countertops despite MSI's recommendation and using it on previous quartz countertops without issue. Unfortunately, I learned this lesson the hard way :(