The ball on my tow bar does rust like that as well if it has not been used for a couple of months or so.
It is easily cleaned up with a bit of coarse wire wool, but I have now taken to wiping the ball with a bit of light grease after use.
This is not a problem if I am using the trailer next time, but I have to remember to clean it off with some thinners on a rag if I am going to tow the caravan.
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2018 V90CC D4, 2022 XC40
1940 Matchless G3, 1980 Moto Guzzi T3
Coming soon:- 1947Rover 14 P2
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