Does anyone know what these "yellow/gold spots" are on my kitchen marble countertop? And how do I get rid of it? My countertops are about 6 years old. I had the installers come by and they are baffled because they have never seen this before which they referred to as "rust spots". They are just randomly popping up. I only use the suggested marble cleaner suggested by the installers or dishwashing soap and water. I am hoping someone on Houzz is familiar with this and knows of an easy fix to this.