Making a Porcelain Sink Sparkle is As Easy As 1,2,3 and 4!
Spray with bleach and scrub Next, spray bleach, or a bleach product, over the entire sink and leave it to sit for a few minutes. Gently scrub the sink again and rinse. At this point, any yellowing should have been eliminated, but tougher, darker stains are still likely to be visible. 4.