green/ bio degradable cleaners

I was asking in a mt biking forum about cleaning the chain and many people suggest to use bio-degradable detergents. Then one guy said bio-degradable detergents is useless in not polluting the environment because once you have used it, it won’t be environmental friendly anymore since it has been containminated with the dirt you just washed off. I find it kinda true. So how does it work? Are they really environmentally friendly?

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