It sounds like cuckoo spit. It's a lavae of an insect (I think) It can easily be cleaned of with a bit of tissue or just your fingers. It's not really spit, by the way, it's the sap of the plant that the insect sucks from the plant and covers itself in to prtect it.
I think I am right but someone will put me right if not. I am only a novice too but thought I would give this a go to see if I got it right.
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