What are the disadvantages of alcohol based sanitisers?

Alcohol based sanitisers are effective at killing the germs that are on your hands whilst you are rubbing it into skin but as soon as you touch a contaminated surface the bacteria are back. Most alcohol based sanitisers are either gel based, which leaves a sticky residue on your hands or a rub and leave your hands very wet. These type of sanitisers do have other disadvantages:

• Toxic
• Dry out skin which can lead to cracked and itchy skin and increases the risk of infection.
• Flammable