How to clean a tennis racquet's handle

How do I clean it? It was white, and now there's a little bit of grey, it's because my hand is sweating, and I tried to clean it, but it's not going' away!!!
I'm the kind who really cares about thing being super clean and smelling good (got it from both of my parents, lol)
And it really pisses me off to use something dirty that I can't clean!!!
How does it go???