Rohloff® Special Bike Chain Lubricant claims to be "rapidly biodegradable". It says so on the bottle. I've always suspected it's some sort of vegetable oil, maybe even olive oil. I use it on my Wipperman chain, but not on my salad. It works as well or better than other stuff I've tried over many years and cleans up more easily than petroleum based lubes. I use Chain Drain Bean Clean for that.
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