I recently picked up.some second hand bubble plates. They were black and blue all over.
Soaked them for 48hrs in Citric Acid, but they didn't clean up that well.
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I resorted to using steel wool to scrub, but it was taking ages, with little results.
I saw this thread and did a 551 mix, after dismantling the plates.
Soaked for an hour, still hard to scrub off blue stuff.
I then put them into a vinegar/salt bath for an hour or two.
After this it made it easier for the steel wool to remove most discolouration.
It was tricky trying to scrub inside the caps, but I figured that the sac run will sort em out.
Chucked them all in the oven at 170° for 15mins, after a few rinses. When I took them out I noticed blue dust on the aluminium foil. So I grapped a steel spoon and tapped the caps and a stack of blue stuff, that I could barely scrub, just fell out.
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Plates came up pretty good in the end. Sac run should make em right.
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