My brother and I both carry extra alcohol prep pads specifically to clean our knives with. He's religious about keeping his clean, I'm religious about keeping it clean AND sharp. I also try not to use my normal pocket-carry with nasty stuff, I have others for that. If I'm with my truck, I have another. If I'm at work, I have several others. At home, I have the whole collection. But, bottom line is, I don't mix Nasties and Food.
-Kyle