Stainless-steel sink marks: dry after use and avoid steel wool and bleach
Dry a stainless-steel sink after gentle cleaning to reduce water marks. Franke cautions against bleach, wire wool, harsh abrasives and prolonged contact with acidic or salty foods.
Franke explains that apparent rust spots or rainbow marks may result from deposits or iron particles rather than the sink body itself. Start with gentle, suitable cleaning and thorough drying rather than aggressive scrubbing.