Can CLR be dumped down the drain?
Fragrance free- safe for all pipes and drains! Part of the EPA's Safer Choice Program recognizing the product as a safer alternative to traditional chemicals, and contains no phosphates and is Septic Safe.
I recommend staying away from heavy acid-based cleaners like CLR or Lime-A-Way. The heavy acid in these products can damage rubber or metal components of the drain system. Because most over-the-counter chemicals that you use to unclog drains can be very harsh, I recommend not using them repeatedly.
- Spray CLR Bath & Kitchen Cleaner directly on the sink's surface.
- Wait 2 minutes.
- Wipe the sink down completely with a clean, damp sponge or cloth.
- Rinse the sink with cold water.
Apply directly to the calcium, lime or rust stain with a brush, cloth or sponge and rinse promptly with cold, clean water. Never leave CLR on an area for longer than two minutes.
Yes, CLR is septic safe. By the time it reaches the septic system it is neutralized with water.
Use CLR on many surfaces in your bathroom, even the PVC pipes under your sink. But its cleaning performance extends far beyond the bathroom. It's also effective on porcelain, stainless steel, brick, chrome, concrete, and fiberglass. It's no surprise that CLR is the #1 selling calcium, lime rust remover in industry.
You can clear your kitchen and bathroom faucets of water stains and more by filling a plastic bag with watered down lime and rust remover—such as CLR—and allowing it to soak for a few hours.
3. Don't leave CLR for longer than two minutes. Again, CLR is acidic, which makes it effective, but also means it can cause damage if left in contact with surfaces for too long. Always rinse away with cool water after two minutes of contact.
WARNING OVERVIEW: Irritating to eyes, skin, respiratory tract and mucous membranes. Risk of burns to eyes, skin, and respiratory tract. May be harmful or fatal if swallowed. Use with adequate ventilation.
Both CLR and vinegar are great for cleaning many surfaces and stains, but CLR is a chemical cleaner with 15 times more concentration and enhanced qualities to beat tougher stains, including hard rust. Vinegar is a natural cleaner, so it is safer to use and does not cause damage to the item, but it is less effective.
What is the best way to use CLR?
How to clean the bathtub with CLR Calcium, Lime & Rust ... - YouTube
Dispose of unused product in a permitted hazardous waste management facility following all local, state, and federal regulations.

DO not use CLR on any natural stone or marble (including cultured marble), terrazzo, coloured grout (any other colour than white), any painted, coated, sealed or metallic glazed surfaces, plastics (Food grade or soft), laminates, Formica, Slate, Titanium, Rubber, Corian, aluminium, galvanized metals, nickel, oil rubbed ...
Bicarbonate of soda added to the cup of water neutralises any remaining active acid of CLR in your kettle after the first rinse. For really tough calcium, limescale or surface rust stains, repeat the process above until your kettle is clean.
CLR may etch older sinks, tubs, and tiles. Avoid contact with wood, clothing, wallpaper, carpeting, natural stones, brass, copper, aluminum, galvanized metals, any painted, coated or sealed surfaces.
We do not recommend using CLR on galvanized metals. When a metal is galvanized, a Zinc coating is put over the metal (usually to protect it from rusting). The acids in CLR will remove the Zinc which could compromise the material.
CLR Bath & Kitchen Cleaner is part of the EPA's Safer Choice Program recognizing the product as a safer alternative to chemicals and contains no phosphates, ammonia or bleach. Spot test all surfaces in an inconspicuous area. Important: Wear household rubber gloves.
How To Over time your toilet water can cause an unsightly rainbow of stains and mineral build up in your toilet bowl. CLR® Calcium, Lime & Rust Remover helps you flush the filth away.
Apply CLR Calcium, Lime & Rust Remover directly to the stains and scrub with the brush or pumice stone. Wait for 2 minutes then flush the toilet.
Cleaning a Sink with CLR
CLR Mistakes to Avoid
What will neutralize CLR?
What should you not use CLR on?
CLR may etch older sinks, tubs, and tiles. Avoid contact with wood, clothing, wallpaper, carpeting, natural stones, brass, copper, aluminum, galvanized metals, any painted, coated or sealed surfaces.
We do not recommend using CLR on cast iron. The acids in CLR can compromise the metal.
Both CLR and vinegar are great for cleaning many surfaces and stains, but CLR is a chemical cleaner with 15 times more concentration and enhanced qualities to beat tougher stains, including hard rust. Vinegar is a natural cleaner, so it is safer to use and does not cause damage to the item, but it is less effective.
To restore dull spots from CLR use the ETCH REMOVER / Marble Polishing product which is specifically designed to remove etch marks from "polished" marble and make the surface shine again. It's easy to use, but since your marble suffered repeated damage you may have to apply the paste several times.
SKIN CONTACT: Can be irritating to skin, prolonged contact can be more severe, no adverse effects during normal usage. In case of skin contact, rinse area for at least 15 minutes. Remove contaminated clothing and shoes, wash thoroughly before reuse. If irritation persists get medical attention.