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any type of rust surface or if its goes through, after any type of repair the metal needs to have some sort of corrsion resistant product or the rust will come right back in a few months
the wiper arms the washer nozzle is just cliped on the arm, so gently remove with a small falt head screw driver, if you break the nozzle you have to replace, obviously
if its just surface rust on the arms sand it with 180, then 240, then scuff the arm with a red scuff pad, me personally i would por-15 the arms, no need for a etch prime or sealer to prevent rust
more.....................
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