What's the best way to clean battery contacts with a Sony a6000?

What's the best way to clean battery contacts with a Sony a6000?

Today I got a “for parts” off ebay and the seller stated that when he put in a Sony battery it would display: Batterie incompatible. Utiliser le mobèle correct. Then promptly turn off. I thought it might be an easy fix since I have had an issue with a few batteries I got off Amazon a few years ago. Neither battery would work in my nex-3n at the time. I looked up the issue with the batteries and found the identical batteries on a thread where fake batteries on dpreview:

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Guest [Entry]

"You can use for contact cleaning some solution. I prefer (it is avaiable from local store) Cleaner KONTAKT 60 by KONTAKT CHEMIE. You can add some acid to it if it is a strong rust vinegar or lemon juice. Don’t forget to wash out acid. For washing electronics I use isopropyl spirit rather then ethanol.

As for rubbers I prefer not to use any because you can easly scratch electroplated layer of nickel, and then oxydation occurs much faster.

BTW, I don’t know about your camera, but my canon accepts batteries with some special chip only. Otherwise it can’t show level correct."