[I don't know what that is, the chemical you described. But if you can rinse it out with water, do so. I filled my barrels with water to the top and overflow, and left the hose running for about 30 minutes. Then I let it soak ovenight. The next day I drained it and let it air dry.
Then I repeated that procedure one more time. You could also pour in 1g of white vinegar in with 54g of water, and let that soak over night.
Smell the container when you are done to see if it smells of the original chemical.]