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Generally, nothing else, though with polish can be useful too, try nothing else first. IME, the earlier in the stain's life that you hit it, the more likely it is to be easily removed, YMMV.

Steel wool works but can get everywhere and, if the blade is magnetized is a total pain. Water spots can come off with a crunched up ball of Aluminium foil. With all these methods, including Maas,...