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so I couldn't find a brick that I needed to rebuild one of my kits, and I dug into my old tub of childhood lego and managed to find one, but it was entirely scratched up from being in a gigantic tub with thousands of other pieces god over 25 years now.
So I realized I have a buffing wheel in my garage that I use to polish metals for woodworking stuff I do, and tried using it with some metal polishing compound to see if all the scratches and dents in the brick would buff out real quickly. Surrounded the brick with a bunch of yellowed old white ones to protect the edges, and it worked out pretty damn well.
I think if I get some better polishing compound of a finer grit I can make my older pieces look nearly brand new with this method. A lot of my older translucient pieces are like this too and it would be really cool to polish off many of my old bricks and re-build my old sets making them look like new.