Delicate electrical parts can be cleaned using alcohol wipes instead.
If you have a large collection, divide them into containers of about 200 or 300 each.
Never use a cleaning product that contains bleach. Never use water above 104ºF (40ºC).
Clear plastic pieces such as windshields are easily scratched. Rub them with your finger instead.
Do not use a hair dryer, which can damage the bricks.
You do not need to dry your bricks before following these instructions.
Because the hydrogen peroxide reacts with ultraviolet light, only sunlight or a UV lamp will work. Do not use this method for parts with stickers and electrical parts.
Although 3% hydrogen peroxide is safe for skin contact, wear gloves and safety goggles to minimize exposure, and keep away from mouths and hair. Children should have an adult handle this for them.
If no bubbles form on the pieces after an hour, the hydrogen peroxide has broken down into mostly water. Dispose of the liquid down the drain and try again with a new bottle.
