I got some klean-strip acetone a while ago from home depot.
I’m not 100% sure, but I don’t think lighter fluid is superior. I think it’s just available in smaller containers than acetone, and maybe it seems more available to some people. If you live in a big city, the convenience or the grocery store down the street probably has lighter fluid, and it would take a lot more effort and time to get to a hardware store.
Mazel Top says you should not use lighter fluid in bearings.
The shields are off when you clean the bearing. Are you putting the shields back on? If so, you might try the bearing without the shields. Just a thought.
I am referring to the non-industrial that can be bought at most grocery stores. The issue is that they claim 100% acetone but still have separate additives designed to cause vomiting if swallowed. I am not certain these additives are good for yoyo bearings. With my experience the 100% acetone I have bought from a normal store has not worked nearly as well as lighter fluid or mineral spirits which are almost as accessible.