I have quartz countertops that have scuffs from rubber feet on appliances. I wasn’t aware this could happen. Problem is , no matter what I try, the scuffs won’t come out. Now I question whether they are true quartz or a lower grade quality. They do say Belenco on the underside. However, the website for Belenco is no longer available when I search for it. Any suggestions for removing the scuffs?