A little while ago, I had a counter installed in my laundry room. It was 2 pieces and it was joined at a seam. The installers also did a silicon caulking to seal any gaps at the walls.

While they were doing this, I asked them to help seal a gap on another counter which they did.

A day or two later, I noticed this on the counter top. I’ve tried using a scraper (plastic and metal), soap, barkeepers friend soft cleaner, but nothing will really get it off. The scraper dislodged a tiny bit but nothing significant.

Any ideas??