Green Oil Wet Chain Lube was developed out of a frustration. Other lubes were petroleum based, mostly contained PTFE and even said 'Dangerous for the Environment' on the bottle.
Green Oil is a biolubricant. It's made from plants instead of petrochemicals.
Green Oil Wet Chain Lube is 100% biodegradable.
Not 'biodegradable with PTFE', a line some brands suggest.
Apply to the inside of your chain for one length, spin the cranks.
Wipe off excess with a rag to keep the chain nice and clean - you only need the oil between the links where the friction occurs.