I use most anything. A lot of deer that I have gutted were done with small folding pocket knives. I have done some with an inch and a half cutting edge Kai including skinning. I have done more with a Gerber LST. My preference is small fixed blade knives, 3 inch blades. made from decent steel.

I do not find folders to be any harder to clean than fixed. Hot water and Dawn makes short work of it. Nor do I have issues with slick handles. Once I have a little blood on the handle it gets sticky.