Silly String Curbside Trash Aerosol Cans Are Hazardous Waste The silly string container is an aerosol can. If there’s even a drop of liquid left, an aerosol can is still pressurized and can explode, so dispose of it as hazardous waste. Recycle Empty Cans Once an aerosol can is completely empty, it may be recycled with other metal cans. Never recycle aerosol cans before they are completely empty. The String Is Garbage Wait until silly string has dried before cleaning it up. It’s easier to remove once it’s dry. Dispose of used silly string in the garbage. Ways to Reduce Use Paper Decorations Use paper decorations instead. You can buy them or make your own. When you’re done, decorations can be saved for reuse or put in the recycling. Choose Bubbles Over Silly String Bubble wands with store-bought or homemade bubbles are a great eco-friendly alternative to silly string.