Silicon Staining Along Grout Joints

Suppose you have an interior granite wall that had some silicon caulking used in the grout joints. The silicon then caused staining along the grout edges. A poultice successfully removed the staining, but then later, the stains reappeared. What happened? In this case, if the caulking is still in place, then the source of the staining is not removed. It will continue to be a problem. The silicone caulking would need to be replaced with a non-staining urethane caulking.

If the stain is still reappearing after the silicone caulking is removed, chances are there is silicon remaining in the stone and it is migrating toward the surface. In this case, poultice the stain several times until all the silicon is removed.