Good info, thanks! I assumed that they were all alcohols due to the -ol suffix, so I just used the most powerful one (methyl hydrate) that I have on hand. I've always thought of varsol/mineral spirits as "dirty" and likely to leave a residue so I've tried to use something else to minimize this problem.
You'd recommend Varsol for this then?
Not that bicycle disk brakes are that fussy, this isn't a flask in the lab after all, but a hunk of metal wailing around in the dirt.