Fingers are not enough to get skin really clean. Fingertips don’t have exfoliators. Use a washcloth or better yet my one of my favorite gadgets, a Clarisonic, every time you wash your face. You particularly want to focus on your nose and chin. Use lukewarm water to wash.
Because the Clarisonic leaves the skin cleaner and more exfoliated, serums and products can penetrate better. I personally use the Clarisonic Mia (a bit cheaper and the size makes it more travel friendly) with a delicate skin brush head and it does the job beautifully!