Why use alcohol at all ??? In the future why not just use your fingers and small tweezers to pull out the hairs?
Another very important point is that ***70%*** isopropyl alcohol is for ***disinfecting*** NOT electronics, as it has to much water in it often with minerals which leave deposits which can short electronic circuits. ***99%*** or very close to that is preferred and is available at electronic component supply shops.
You may also have to wash the area with pure distilled water available as pharmacies. Make sure it is ***completely*** dry before using mouse again as water will short the electrical circuits.