Levent Konuk / Shutterstock.com Legos Put in Garbage Cart/Bin Levent Konuk / Shutterstock.com If your Legos are in good condition, consider donating them. Wash Before You Donate It’s a good practice to wash Legos before you donate or sell them. Soak Legos in warm water with some detergent and then air dry. Ways to Reduce CTR Photos / Shutterstock.com Buy Used Legos Legos are made from plastic #7 and so are incredibly difficult to recycle. So the best way to prevent Legos from sitting in a landfill is to buy used ones. This approach keeps the Legos already out there in circulation. Did You Know? Lego to Spend $1B on Going Green The World’s Most Popular Toy According to a 2010 survey by Firebox.com and Toyology.com, Legos are the most popular toy ever manufactured.