Sending old wheel hubs to the city dump is an option, but it’s not the most eco-friendly way to dispose of an old unit. Recycling is a better option, and it can net your shop some extra cash, if you try it. It’s important to wipe old parts and remove any environmentally hazardous substances, including grease and lubrication, before you visit a center. You also need to collect enough parts to make it worthwhile to visit a center. You can collect scrap metal parts in your shop, using a plastic collection bin or another designated storage container, until you’re ready to turn a profit.