I have a "clean" funnel for oil, I put it in a plastic bag when I'm done with it and only use it for pouring fresh oil. I have a "dirty" funnel for pouring old engine/fork oil or brake fluid or such into bottles for disposal at the amenities site.
I get what you're saying about the filter torque, it looked too tight for me, but that's because I don't do filters up tight at all. My old filters are that "loose" that I can undo them by hand without problems.