What is the best shaving cream to use for razor lines?

I'm a Barber and as a touch up for a client's haircut, I'll go over my client's hairline with a razor or give them a neck shave, but what shaving cream is there that would make the hair come off easily. I use Gilette and it sometimes dries up. Thanks in advance.|||Try Aveeno shave gel. It's the best I've ever used. It gives a much closer and smoother shave than anything else.