Caring for a Copper Kitchen Sink Day to Day

Copper sinks are not high-maintenance, but they are different from stainless steel. The surface is alive in a way that stainless is not. It responds to what you put on it, and it changes colour over time. Most of that change is normal and expected. A few things will damage the surface in ways that are harder to reverse.

Daily cleaning ¶

Mild dish soap and warm water is all you need for daily cleaning. Rinse the sink after use and dry it with a soft cloth if you want to slow the patination process. Standing water accelerates colour change, particularly around the drain. If you do not dry it, the sink will develop a slightly uneven patina faster, which some people prefer and others do not.

Do not use abrasive scrubbing pads, steel wool, or scouring powders. They scratch the surface and remove the patina layer unevenly, leaving marks that are difficult to blend back in. A soft sponge or cloth is all you need.

What damages copper ¶

Bleach is the main one to avoid. It reacts with copper and can cause pitting. Small depressions in the surface that are permanent. This includes bleach-based cleaning sprays, some dishwasher detergents, and drain cleaners. Read the label before using anything in or around the sink.

Acidic foods left sitting in the sink. Citrus juice, vinegar, tomato. Will lighten the patina in the contact area. This is not structural damage, but it can look patchy. Rinse acidic spills promptly and the effect is minimal. If you get a light spot, it will usually blend back in over a few weeks of normal use.

Restoring the surface ¶

If the sink develops a colour or texture you are not happy with, the surface can be restored. A light application of copper polish (I recommend a paste type rather than a liquid) will remove the patina and bring the surface back toward bright copper. From there, you can re-patinate with a liver-of-sulphur solution if you want a darker finish, or leave it raw and let it develop naturally.

I include a one-page care sheet with every sink that covers this in more detail. If you have a specific situation. A stain, a scratch, an unexpected colour change. Email me at megan@copperwaveworks.com and I will give you a plain answer about what to do.

Most copper sink owners stop worrying about the surface within the first year. The changes become familiar and the sink starts to look like it belongs to the kitchen rather than being installed in it.