Now I'm not an expert on this but I think any cleaner that can handle rust should work fine. Be very careful not to let the cleaner get onto the finish of the guitar or the pickguard.
Also, if there is corrosion on the exposed poles there's a good chance that there is some corrosion that you can't see. The only way to get at this is to take the pickup out and give it a good going over. At some point you may just want to have a pro do that for you since it can be kind of hard to get the pickgaurd off.
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