Might I suggest you try isopropanol rather than rubbing alcohol. Its 99% alcohol rather than 70%.
Less additives and a stronger cleaning power. You wont need any abrasives either.
Plus for just regular bowl/pipe cleaning ( not that nasty ass cloves resin ) if youre one who smokes their resin you can just run it through and pool the darkened iso on a plate or whatever and wait for it to evaporate ( or accelerate it if you know what youre doing ) and you have smokeables to spread on a paper for a nasty tastin joint that is rich in canabinoids.
I used to smoke it but the taste of pipe resin just turns me off.