(1) For fresh white-colored "white rust":
Rinse the affected area with water
Wipe the zinc coating dry with a soft cloth
Apply a paste made of talcum powder and caustic soda using a brush
(2) For aged grayish "white rust":
Brush the corroded area with an aqueous solution of potassium acid tartrate and ammonium carbonate
Wipe off residue using a calcium carbonate-soaked sponge
Rinse thoroughly with water and dry completely
