Dry lube from Pure, by Weldtite.
Biodegradable wax for dry conditions. 100% free from petroleum based solvents
For best results, apply to a CLEAN chain.
Top tip 1: apply lube 1 drop on each bushing at the bottom of your chain, then back pedal to keep applying at the bottom. This prevents lube from dripping onto your chain stay (if you applied at the top of the chain). UNDER NO CIRCUMSTANCES are you to apply lube over your cassette and back pedal. This is lazy and terrible for your drivetrain, causing a buildup of lubricant on a part that doesn't need it.
Top tip 2: Use a dry lube as your regular lube, as it won't attract dirt and grit, and will keep your chain clean. Yes, you'll have to reapply more often, and yes, it will wash off easily in rain, but us mechanics would much rather see a dry clean chain rather than a mucked up oily one.
Does the job well. I am most glad that it is not harmful to the environment.