I have for many years enjoyed a marble bathroom countertop that Oliva installed perhaps in 1996. But in the course of the last 3-4 years, I noticed an unsightly brownish-grey stain had appeared. It is symmetrical and in the very front of the bowl. I went by the shop and was courteously served by the women at the counter, She said none of the workmen were available but that sometimes it is possible to do a wash. I left my name and contact info. No one followed up,. That was the first of perhaps 4 or 5 attempts to talk to someone who could help. I have emailed, called and gone to the shop. No response. I am upset.