May as well throw my 10 cents worth in here, gleaned from 35 odd years of riding on the road and trying a myriad (big word for a friday that) of products.
Basically I have settled on two spray products, both mentioned here previously:
Belray super clean. This has been my go to for the last 10 years or so and the bonus is they also do a little 175ml can that I can tuck under my pillion seat when I'm on tour.
Total. A racer friend of mine is sponsored by a Total Lubricant distributor so I've been given some free product the last couple of years. Equally as good as the Belray IMO
Having said all of that I have riding buddies who swear by 80/90 gear oil and I was dubious of this but... I recently watched this fortnine shootout of chain lubes:
https://www.youtube.com/watch?v=VnPYdcbcAe0
The presenter is highly annoying but if you get past that then it is of interest. Basically the gear oil is right up there with the best of the sprays.
Food for thought.
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