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A sharp knife.
Heres what i use just joking, just my handy knife and friends.........
when i used a folding blade it was hard to clean out all the nooks and crannys. i got a kershaw interchangable blade system as a gift and it worked pretty darn good this year. IMO.
as for cleaning a folder-some good ol' hot water is all I use, just spray out the gooey goodness and be done.
As in most cases with hunting gear......to each his own............. My advise would be use what works for you, get good at it then you can depend on it.