When I used to service computer room tape drives, we were allowed to purchase a bottle of Everclear for cleaning tape heads and put it on our expense reports! It's definitely a good, clean solvent that doesn't leave residue. It so pure that when you open the bottle, it absorbs a tiny amount of water from ambient humidity in the air, so keep it capped. it's almost impossible to have alcohol that doesn't contain a tiny amount of water, but PGA is the closest.
Don't use rubbing alcohol. It's not pure and contains lots of water. It's also poisonous if consumed.