Rust stains can sometimes be removed from concrete by scrubbing with a solution of four ounces of oxalic acid in a quart of water. Oxalic acid is sold in crystal or powder form at paint stores.

A: Oxalic acid is a potent but toxic cleaner that removes rust and stains caused by iron, water and tannic acid. It's available in dry crystal form, to be dissolved in warm water for use.

Forgot a pot in the sink? Don't let rust spoil your day, or your sink. Try these no-fail methods to remove rust.

I tried bleach and a chemical remover to no avail. Can you help? A: Rust stains on concrete seem to respond best to acids of various types. The classic treatment is oxalic acid, which is sold at […] ...

Potatoes contain oxalic acid, which converts rust into a water-soluble salt that dissolves in water and easily rinses away. Cut a raw potato in half. Put a few drops of dish soap on the cut sides.

Not too many years later, I learned that oxalic acid can solve a different problem. A reader had written to me about removing rust from concrete. I asked a chemist friend for advice and he said ...

The secret is oxalic acid. Found naturally in rhubarb and other vegetables such as spinach, ... I keep it handy in my laundry room to remove rust stains from the inside of my clothes washer.

Oxalic acid solutions are the go-to cleaner for exterior redwood. If you recall your high school chemistry, you know that acidic solutions have a pH lower than 7. Caustic chemicals like many ...

According to Future Market Insights, the oxalic acid market is projected to grow from USD 1 billion in 2025 to USD 1.7 ...

Every week, readers reach out to me with fantastic questions about a column of mine they have just read. Often they ask why I didn’t delve deeper into the topic. The answer is that newspapers ...