How to Clean a Porcelain Bathtub — Toronto Home Guide

Porcelain enamel bathtubs — the classic cast iron or steel tubs with a white glazed surface — are durable but can chip, scratch, or stain if cleaned with abrasive products or harsh chemicals. The right approach keeps the enamel bright and extends the tub's life.

Standard Clean

1. Wet the tub surface
2. Sprinkle baking soda over the entire surface — it's mildly abrasive enough to remove soap scum without scratching the enamel
3. Scrub with a non-scratch sponge or cloth in circular motions — work from the top down toward the drain
4. Pay attention to the waterline ring, the area around the drain, and the caulk line
5. Rinse thoroughly

Soap Scum Build-Up

For thick soap scum that baking soda alone doesn't cut:

1. Spray white vinegar over the soap scum and let sit 10–15 minutes
2. Sprinkle baking soda over the vinegar — the fizzing reaction helps loosen the scum
3. Scrub with a non-scratch sponge and rinse

Rust Stains

Orange rust stains come from iron minerals in the water or rusty fixtures dripping:

1. Apply a paste of cream of tartar and lemon juice to the rust stain
2. Let sit 30 minutes
3. Scrub gently and rinse
4. For persistent rust, Bar Keepers Friend (oxalic acid) is effective on porcelain enamel — apply with a damp cloth, scrub, and rinse well

Yellow Staining

1. Mix equal parts hydrogen peroxide (3%) and baking soda into a paste
2. Apply to yellowed areas and let sit 30 minutes
3. Scrub gently and rinse

What to Avoid

• Steel wool or abrasive scrubbing pads — scratch the enamel permanently, exposing the steel underneath to rust
• Bleach on coloured porcelain — fades colours; fine on white tubs in moderation
• Ammonia-based cleaners — can dull the enamel glaze over time
• Letting standing water sit — especially iron-rich water, which causes rust staining at the waterline