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I'm building with some yard sale Lego, and have several elements that have orange stains on them. If I had to guess, I'd say something seeped onto the bricks while they were in storage. At this point I'll probably bury them inside my MOC, but I'm curious to know if there is a method to unblemish white Lego elements?

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I guess the first step would be to identify what the stuff actually is (the only idea that comes to mind being cat urine, since an unguarded box of small LEGO parts could be mistaken for a litter box by some); and then whether is comes of or not - I supposed you've tried regular cleaning options already? And are you sure it's orange spots, not simply sun-yellowed bricks? – Joubarc Feb 10 '13 at 21:00
If it's really rust stains, oxalic acid may be worth trying... – Philo Feb 11 '13 at 8:32
So far I tried a warm soapy water scrub with a soft toothbrush... Still have orange stains. Thankfully, there was no litter box aroma. I shy away from those yard sales. ;) – General Decline Feb 11 '13 at 23:32
Does it happen to look anything like this? – Ambo100 Feb 19 '13 at 19:08
@Ambo100 Quite simular. Sorry, I should have posted an image. I'll do that soon. – General Decline Feb 19 '13 at 21:44

Maybe you can try with toothpaste and a toothbrush as toothpaste is one of the mildest polishers.

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