Isopropyl alcohol isn't that harmful- just use common sense precautions. Acetone, however, you need adequate ventilation and you need to protect your hands (acetone dissolves the oil in your skin and dries it out).
Also, I could be wrong on this, but how about trying 'canned air' and gently blow on the holes?
Also, I could be wrong on this, but how about trying 'canned air' and gently blow on the holes?