I know its weird but i have used sanitizer and dettol inside my vagina for past 1 year regularly for 2 ,3 times a day will it cause any cervial cancer or vagina cancer?

My suspicion would be the material would act as an irritant and cause the tissue to thicken to a coarse or leathery texture. If that is what you are comfortable doing it is your choice. The body does just fine if you leave these sites alone. I know of no link to cancer but also wouldn't expect anyone to fund the research to see if there were one.