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Quoted from PinMonk:Yeah, you want to arrest the corrosion you DO have before it gets worse (i.e. gets into the traces). The good news is it looks extremely minor and should be easy to clean up.
This.
I just rebuilt a Sys80 MPU with some stout damage, get it cleaned up. If its working, great! No reason to replace the MPU. Get rid of the battery holder (remote pack or nvram) and neutralize with zep acid based toilet cleaner, stuff works great. $4 at Home Depot.
Quoted from YeOldPinPlayer:Start with vinegar and a soft brush. Rinse with distilled water.
If you're not happy with those results there is a thread here about using a strong acid, search around for it.
I have used vinegar and Zep, skip the vinegar and go right to Zep.
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