I agree with the MUC-Off Wet lube and also the Finish Line Green wet lube, I stopped using FL WET years ago as it just went black, Bought the Muc-off last Autumn and its probably worse,
Tried lots of Lubes over the years and found the Rock n Roll stuff a staple in all weathers, I Cant get on with Squirt, Purple Extreme also went black.
I know GT85 is NOT a lube but its as good as some of these expensive lubes and doesnt turn the drivetrain black.
I fitted a new chain to my road bike a Month ago, And as yet i havent lubed it AT ALL, its still got the factory cack on it, the cassette is dry and clean as is the chain, its a bit sticky in places and a bit of muck accumalating but im seeing how long i can run it without lube, Admittedly the last ride yesterday was a bit sticky in gear but it was cold. I’ll keep you posted.