I use this specifically to make my keys look nice again but have used it a few times already. , and it's hard to tell where the dirt is and where the natural tarnish of the metal is. We just bought a house (well, the bank bought the house I guess. congradudolences, as they say.) and I took the keys and gave them to my SO and wanted to give her shiny keys that are for a new one House are suitable, not stupid old keys. So I scrubbed them with these wire brushes, soaked them in a little vinegar, then gave them another scrub, soaked them in a little more and washed them off and they were shiny and brassy like new. I don't think there is anything special. The thing about these particular wire brushes is that they work great, appear to be durable, are inexpensive, and come in three hardness levels so you can choose the one that works best.
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