I would start with oxalic acid ... At the end of the waiting period, take a clean cotton swab and try to suck up the droplet of acid you put on the counter. If the tip of the new cotton swab ...

the name comes from using oak and other wood to tan hides into leather. Whether you’re dealing with a stained tabletop or stained paneling, it’s often possible to apply oxalic acid to reverse ...

never use metal with oxalic acid. Apply it to the stains with a paintbrush. Let it stand for a half-hour or so and wipe it off with a clean, white cloth dampened with white vinegar to remove any ...

A: Rust stains on concrete seem to respond best to acids of various types. The classic treatment is oxalic acid, which is sold at some paint stores for use as a wood bleach. It is often sold in ...

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 small amount of ferric oxide is added to a solution of oxalic acid, a commonly used cleaning and bleaching agent. Once the rust is dissolved, potassium carbonate is slowly added to the solution ...

Authorities warned that oxalic acid be stored properly since it is also used in the household as a cleaning agent. It's colorless when mixed with other liquids like water but is sour to the taste.