How to Restore Brass Using Hydrochloric Acid

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Cleaning brass with hydrochloric acid can be an effective method, but it requires caution and proper safety measures. First, ensure you are in a well-ventilated area and wear protective gloves, goggles, and clothing. Dilute the hydrochloric acid with water in a 1:1 ratio. Submerge the brass item in the solution for a few minutes, then scrub gently with a soft brush or cloth. Rinse thoroughly with water and dry immediately. Remember to dispose of the acid properly and avoid contact with skin or eyes. This method should only be used as a last resort for tough brass stains.


Over time, brass can become oxidized and lose its shine. No matter how hard you try to clean it, it just won’t regain its former brightness. However, using hydrochloric acid, also known as muriatic acid, can help you bring back the beauty of your brass. The acid works by removing the dull outer layer and revealing a fresh, radiant layer underneath. It’s important to note that this method can make your brass thinner, so it should only be used when absolutely necessary.

Step 1

Start by filling a sink with warm water and adding a squirt of liquid dish soap.

Step 2

Gently lower the brass item into the soapy water. While holding it just above the water, use a soft to medium-bristled cleaning brush to scrub away any dirt and dust from the surface.

Step 3

Prepare a bowl that is deep enough to fully submerge the brass item. Fill it with a solution of hydrochloric or muriatic acid, using a concentration of 32 percent.

Step 4

Submerge the brass item in the acid solution for one minute. After that, lift it out and rinse it thoroughly under cool running water.

Step 5

If there are still some stubborn spots on the brass, you can use fine steel wool dipped in the acid to gently rub them away. Make sure to rinse the brass again under cool running water afterwards.

Step 6

To prevent water spots, carefully dry the brass item using a microfiber towel.

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