I just left a half empty container (open) outside near my garden, figuring rain, heat, and nature would clean out the container. Nope. Couple months later, gray, rubbery, sticky goop. Needed to take a stick to it to pull the crap out, and blast it with a garden hose.

I just left a half empty container outside near my garden, figuring rain, heat, and nature would clean out the container. Nope. Couple months later, gray, rubbery, sticky goop. Needed to take a stick to it to pull the crap out, and blast it with a garden hose.