I use regular hair conditioner. I've never had a problem. I use it on the vag and my legs. I let it sit for a minute or two before I start shaving. I've found the key to preventing irritation is to have an awesome razor (I use razors designed for men, with four blades) and let the hair get plump with moisture before attacking it. Pulling the skin taught also helps quite a bit.

I would be very careful with using Neosporin for shaving. I know the porn stars recommend it, but it's an anti-bacterial medication and the bacteria in that area is there for a reason and needs to remain there.