Excuse me everybody knows stainless steel door word appears black dot how to deal with? Can it be polished?

Hand polishing can achieve the mirror surface, but there is physical damage to the surface. Will reduce the corrosion resistance, specifically in the impact of smoke test results.

Electropolishing can achieve the mirror, but the environmental pollution is very big, and it can not get the favor of big manufacturers.

Plasma polishing can achieve the mirror, using neutral conductive solution, in line with the requirements of environmental protection.