I have to use all options to offload nose contents on bike. This is a year-round problem for me. Most of my friends know not to ride too close behind me, but it's tough when you're in a paceline. So often I tie a soft bandanna loosely around my neck and grab up and use the pointy part of the triangle whenever I have to do a quick, no-consequences-behind-me blow. Or sometimes I use a Snock - cut an end off an old cotton tube sock, pull it over your arm, and have at it! Just remember to pull it inside-out on your arm (or off) if you have to make a store stop, as you will be asked about it!
"It is easier to go down a hill than up a hill, but the view is better from the top of the hill." [Fortune cookie from post-ride buffet at the Peking Palace. The food was good, too.]