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Sunday 17 December 2017 at 07:07
It's fixable. I've seen a lot worse.
Quoted from gmkalos:You should use vinegar to naturalize the acid and start cleaning up the traces.
I've been using Zep toilet bowl cleaner instead. It's more acid and does a much better job at neutralizing the alkaline.
Source: http://pinside.com/pinball/forum/topic/is-it-worth-trying-to-save-this-wpc89-mpu#post-4127884