She is 9 day old.
I am seeing some whitish sticky substance surrounding her clitoris for past some days.
Do I need to clean it? If yes, how?
It is probably just vernix:
You can wash with baby wipes, just warm water, or warm water with a very mild soap.
In your question you referred to her vagina, which is internal and should not be cleaned. You should only clean external organs.
Source: National Institute of Health: Paediatrics & Child Health
I was told to leave it alone. you don't want to irritate her vagina, it should come out with a good bath in warm water & gentle soap.