Isopropyl is commonly sold here in the US because Isopropyl is a byproduct of the petroleum refining industry.
It is sold most commonly at 80% (diluted with water) as "rubbing alcohol"
which is actually used more as a topical disinfected.
But can be found at department stores and auto parts stores as "DryGas"
in it’s anhydrous form (for absorbing water contamination from fuel)
But be aware that the cheaper “Dry gas” substitutes Methanol which is a somewhat more agressive solvent (and is also corrosive), and is a less effect water absorbent for petroleum fuels because methanol is not entirely soluble in gasoline. so READ THE LABEL before buying
“Methylated spirits” as the Brits call it or “Denatured Alcohol” is a byproduct of the distillation industry, which is literally poisoned to make it tax exempt.
while none of the alcohols are particularly agressive solvents I find liquid dishwashing soap & water cleans the discs to remove finger schmutz as well or better as any actual solvent, with a lower risk of damaging the discs.
Especially since alcohols are not particularly effective degreasers
and those solvents that are good degreasers tend also to be contact
solvents for most common plastics.