That's a Good Idea, Thank's for that. I actually used them on my last trip and the mud had already dried and caked on. I spent a while trying to clean them off with my fingers and a rag ... and blowing on them .... to make sure no dirt was dropping in my tank. I also carry a funnel for easier filling. Sounds like you've had experience with this. Good Idea!Have you ever thought about wrapping your full Jerry cans with a saran wrap to keep some of the dirt away from the nozzle?