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Rather than rubbing alcohol which contains other ingredients that may not be desirable, I'd suggest isopropyl alcohol 99% or better usually found at drug stores. If you want the really pure stuff go for the 99.953% pure Anhydrous version found at electronic part supply shops. I use this all the time to clean my Arctic Butterfly after use.
Use a small container to put a few millilitres of alcohol in:
1. Dip the the bristles in the solution, swipe it around to dislodge particles then spin, dump out fluid.
2. Rinse and repeat if you got lots of oil on the bristles.
3. The last step is dip in clean fluid and do not spin, let air dry and cover with bristle protector. If you spin as the last step the bristles will flare out because they are wet and you will never get the protector on.