Seriously.
For all those times you go to an outdoor venue and theres pee (or worse) all over the seat, the floor, etc etc forever and ever amen...
http://www.travelmateinfo.com/
HANDY. then just carry a little bottle of water/alcohol (or everclear/151 if it's one of THOSE venues) and rinse after use. Wipe dry. Stash in a plastic baggie. Done.

...but practice first.