Years ago I bought way too many Craftsman Tools. (If that is really possible...nope). For those of you who don't know Craftsman is an American brand from Sears and it comes with a lifetime warranty. They have always been a good tool and I have had many for up to 40 years. If you ever visit the USA go to a Sears and have a look. I have every imaginable tool that they offered...never had to replace one.
This particular wrench was bought about 20 years ago, There was some very slight rust discoloration. While this is hardly a test case I thought I would share anyway. We have on our website the saying Protect your Assets and that is what I do...buy it once...buy it for life...maintain it.
I won't post a blow by blow but you can see from the photos in order that I have dipped in Rust Remover...I keep a jar on my bench..I then wiped it off and sprayed with CorrosionX. I keep a plastic container for my CorrosionX rag so spraying into the container means no waste.