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:
Vernix is a greasy white substance that coats and protects baby’s skin in the mother’s uterus. Some babies are born with lots of vernix still on their skin. It is harmless and can be washed or wiped off. Losing vernix may cause the skin to peel during the first week of life. This is normal and will go away on its own.
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