Don, I think that the use of 'hub cleaners' is currently coming back into vogue - but not for the same reasons that they were originally used... The current popularity that fixed wheel riding is enjoying is also promoting the use of some of the rubber bracelets around the hubs of these bikes.
One such example are the 'skidstrong' bracelets which
are being sold to raise money for the "bicycle messenger emergency fund"
I am considering using the older style leather straps