I agree about the rigidity of the wire, but as a rule of thumb, the wire will have a tendency to slice the offending critter into pieces, allowing these pieces to sometimes travel on into the radiator. Nylon gives a little with the impact, so it's not prone to doing this. Of course, it all depends on how fast you tend to drive relative to oncoming bug bombers. Pull the screen, if you have one, get a spray bottle with soapy water and spray the inlet side of the radiator. Let it soak up to soften the dried on critter goo, then hose out from the opposite (fan) side. No sense driving the rascals farther into the radiator. It's usually a good idea to check the condition of the fins before you do this, 'cause if you've got a good case of the crumbles (fin detrioration) the last thing you want to do is take a high pressure hose to it. Believe me, when you run a couple thousand dollars worth of radiator in front of that big cat motor on your big rig, you learn how to take care of them.

Yelrisheam