The gardasil vaccine may help prevent future HPV infections. It is effective agains the 2 strains that cause 70% of cervical cancer.
In my mind this is preventative care more than current treatment.
Studies show that Gardasil is 100% effective against the strains that are covered by the vaccine, and also quite effective, although by far lower than 100%, against a few other related strains of anogenital HPV. However, it has no effectiveness at all against for those strains with which one has already been infected. So if you want to make sure you'd be protected against future infections, it's a very good choice; but it will not do anything regarding the viruses that you already carry.