Most of that is starch, which you can wash of by briefly putting the noodle in boiling water (a few seconds) and then washing under cold water for a minute or two, then letting it dry.

It could also be prevented by coating it in a wax, like Carnauba wax, which will hold stable at up to 80°C and is chemically friendly to water, so McDonalds and friends would only have to lower the temperature of their coffee a bit.