Some might know this trick some might not-- Roll down your window on your vehicle half way down and you'll see the frost part at the top of the window- run your knife along the edge. I do it all the time at work when my knife gets dull. Try it you'll like it.
Iv’e got a drawer full of fillet knives ranging from $15 to $100 dollars. By far and hands down the best knife you can buy is the Bubba Knife. You can clean a mess of fish, or you can make a mess of a bunch of fish.