The orange goo is a combination of fungi and yeast that happened to land on excessively bleeding sap. Because the sap is such a nutritious source for these organisms and the temperature is mild they flourished producing the orange goo. No need to worry though because they do not cause or transfer any disease to grapevines. It may look unsightly, but it is harmless to the vine. During the growing season they will eventually dry up. If it is really bothersome you can rinse it off with water.