How to Remove Rust Stains from Tub and Sink
Rust stains in bathtubs, sinks, and toilets are caused by iron in the water supply oxidizing on porcelain and ceramic surfaces. They're extremely common in older Toronto homes with aging plumbing. The critical rule: bleach makes rust stains worse, not better. Many people's first instinct is to bleach the stain — this oxidizes the iron further and permanently sets the stain. Use only acid-based products.
Products That Work
1. Bar Keepers Friend (Best First Choice)
Bar Keepers Friend contains oxalic acid, which dissolves iron oxide (rust) effectively. It's available at most grocery and hardware stores:
- Wet the stained surface
- Sprinkle or apply Bar Keepers Friend directly to the stain
- Allow 1–2 minutes to work
- Scrub with a damp cloth or non-scratch scrub pad
- Rinse thoroughly
- Repeat for stubborn stains — multiple applications with dwell time are more effective than scrubbing harder
2. CLR (Calcium Lime Rust Remover)
- Apply directly to the stain and allow 2 minutes
- Do not exceed the contact time on the label — CLR can damage some finishes if left too long
- Scrub and rinse thoroughly
- Very effective on rust, mineral deposits, and calcium buildup combined
3. Lemon Juice and Salt (Mild Stains)
- Apply lemon juice to the stain and cover with table salt
- Allow to sit in direct sunlight if possible — UV accelerates the chemical reaction
- Allow 1–2 hours
- Scrub and rinse
- Effective for light surface staining, not for deeply set rust
What Not to Use
- Bleach: Oxidizes iron further and sets rust stains permanently
- Abrasive scrubbing pads on porcelain: Scratching the surface creates microscopic grooves that trap rust faster in the future
- Vinegar (alone): Mildly acidic — works for light staining but not strong enough for significant rust buildup
Preventing Rust Stains
- The root cause is often a dripping faucet or running toilet that deposits iron-laden water continuously — fixing the drip eliminates the stain source
- A whole-house water filter or iron filter installed on the water supply significantly reduces iron content in the water
- Wipe down surfaces after the last use of the day to prevent iron-containing water from sitting on the surface and oxidizing
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