i love coffee,
Neggel Vasser of the morning is a sakana to drink or walk on. Neggel vasser from a Seuda is not a Sakana. It has nothing to do with Ruach Ra. You dry your hands before eating because you aren’t supposed to eat bread with wet hands. The Gemara compares it to eating Tamei. Rashi explains that it is disgusting.
Some hold that drying is a part of Netilas Yadayim and that even allowing them to hang dry is not enough.