How to Clean and Disinfect Used Bricks: A Complete Guide
Short answer: You do not need boiling water to disinfect bricks. Use 40°C warm water with a neutral detergent, soak for 30 minutes, scrub with a soft-bristle brush, rinse clean, and air-dry for 24 hours in a ventilated area. Keep the water below 60°C; above that, ABS plastic can deform. Do not use a sterilization cabinet, microwave, or alcohol soak, especially for bricks that children use. For the full illustrated process, see BrickPlan's brick care section.
1. Sort Before Washing
Spend about 10 minutes sorting before disinfection. Standard bricks and plates can be washed in batches, but electronic parts, sticker pieces, and fabric or fuzzy pieces need separate handling. Motors and light units should only be wiped dry. A sticker can be ruined by soaking. Water can get into a motor or light unit and cause damage, while fuzzy pieces can hold water and lose their shape. Sort dark and light colors into separate laundry bags so dark bricks do not bleed onto pale ones. Keep each batch to 300-500 pieces; larger batches are hard to clean thoroughly.
2. Soak and Scrub
Use 40°C warm water and add 10 mL neutral detergent per 5 L of water; ordinary dish soap is fine. Soak for 30 minutes so dust in the gaps softens. Then scrub each piece with a soft toothbrush, focusing on the mating surfaces and the recesses around the studs. For stubborn dirt, repeat the soak, but keep the total soaking time under 1 hour. Critical limit: water above 60°C can soften and deform ABS plastic. If the water comes from a hot-water tap, test the temperature before use. Neutral detergent is the safer choice because the aim is to lift dirt without attacking the plastic.
3. Rinse, Dry, and Check
Rinse twice in clean water until no foam remains. Lay the pieces flat on a dry towel to remove most of the water, then spread them on a drying rack or tray. Leave space between pieces so air can move around them. Put them in a ventilated, shaded place for 24 hours. Never dry bricks in direct sunlight; UV exposure can yellow and embrittle them. After drying, check every piece. Discard any brick with mold spots or a bad smell. Before putting pieces back into storage, touch them to confirm they are completely dry, including the inside of stud recesses. Storing bricks while damp is the easiest way to encourage bacteria and mold.
4. Child-Safety Points
For bricks that children will use, apply a higher standard. Choose unscented, colorless neutral detergent and rinse at least three times. The rinse water should be clear and free of suds. After the bricks are dry, wipe the stud surfaces with a 75% alcohol pad and let the alcohol evaporate for 30 seconds. This is a final surface step, not a replacement for washing. Do not soak bricks in 84 disinfectant or chlorine bleach. Residue can irritate a child's skin and can also corrode the brick surface.
FAQ
Q: Can I boil bricks to disinfect them?
A: Not recommended. Above 60°C, ABS plastic can soften and deform. Boiled bricks can develop loose connections and rough surfaces, which affects how they feel when building. If you want heat treatment, soak them in water below 60°C for 30 minutes. That is enough and does not damage the parts.
Q: What is the best way to clean used bricks?
A: The safest approach is 40°C warm water with neutral dish soap, about 10 mL per 5 L of water. Soak for 30 minutes, then scrub with a soft-bristle brush. Do not use alcohol, gasoline, or other organic solvents. They can dissolve the glossy layer on the plastic and leave bricks chalky and rough.
Q: How long do bricks take to dry after washing?
A: In a normal room with good ventilation, about 24 hours is enough for them to dry completely. In humid weather, it may take 2 days. The test is simple: the inside walls of the stud recesses should feel completely dry. If you store them before they are dry, mold is likely. A fan can help if you are in a hurry, but do not use a hot hairdryer.
Q: Can yellowed bricks be washed white again?
A: Normal dirt can be washed off, but yellowing from oxidation cannot be washed white; it is plastic aging. You can try hydrogen peroxide plus UV light as a restoration method. Results vary, and it only works on white bricks. It is not recommended for dark-colored bricks.