Squirt.
Or Putoline chain wax, it makes your divetrain look like it’s been ridden through tar pits, but it won’t come off untill it rains, and even then it only comes off if it’s really crappy.
Downsides, application is a PITA, clean chain in spirits, melt wax on camping stove, dunk chain in and swirl arround, remove chain and find somewhere to hang it and let it cool where no one will notice the foul smell or dripping black gunk. On the plus side I only lube my nice bikes chain once in the summer as long as it avoids rain. Downside it slows shifitng slightly, only realy noticeable on the road bike.