Bad news, Purell junkies.  According to the FDA, you're wasting your time.

 Sure, hand sanitizers do kill SOME germs . . . but when it comes to protecting you against the biggest antibiotic-resistant infections, they fall way short.  That includes things like E. coli, salmonella, H1N1, staph infections . . . and even the flu.

 On their website, the FDA wrote, quote, "Consumers are being misled if they think these products you can buy in a drug store . . . will protect them from a potentially deadly infection.  The FDA has not approved any [of these] products."

They say that washing your hands with warm water and soap for 20 seconds is still their recommended method for avoiding bacterial and viral infections. 

Via (FDA.gov)