finnfinnfriend* Below is Sena's quote. I am hoping she see's this and chimes in.
"Try removing the heater... See if it stops. If it doesn't, good that is not the culprit. I am used to 1. heater snot. Icky, gooey, slimy stuff. OR 2. protein film. It could very well be the heater (or heater snot :) ) Is there any smell in there? Like, rubber, decay, rotten eggs, sweet, etc?" -Sena