CLR is acid based ... should do about the same thing, and a bit quicker. OK for a driveshaft but there are other things you wouldn't want to use it on as it's much harsher than Evaporust.
For that matter, even cheaper would be to get a gallon of muriatic acid and mix it about 10:1 with water. But that stuff can be dangerous in it's pure form. Easy to get at Home Depot etc.
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