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I don't know if this is the generally accepted method, but when I cleaned my old pieces, I put them in a washbasin in soapy water and then used a soft toothbrush to clean them off. After that I just air-dried them. Most of the pieces became nice and clean after this but old discoloration and scratches won't go away. Using hot water (dishwasher or not) and / ...


There is no LEGO product specifically meant for this, however you can use third-party laundry-bags, or even a pillow-case, to wash your LEGO in the dishwasher or washing-machine. If you use the dishwasher, make sure you use the top-rack, and the water should be luke-warm. You can use mild soap.

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