For chemical tankers the stainless steel surface should be smooth ( Ra < 3,5 ) and clean ( grey surface , no cargo residues.
Some product sticks or react and forms hard layers or haze ( like MDI / TDI ) on the stainless steel surfaces.
If removal by chemicals is impossible, the only way is mechanical cleaning by (Ultra) High Pressure Cleaning
In these cases, baffing / grinding is no option for the residues will very quickly saturate the baffing discs and the heat formed by this grinding/baffing will smearing the cargo residues in / over the surface.