I suspect it would depend on the type of gunk and how much of it is non carbonized organics. I've not had any real foaming when I tried it myself. Burned on gunk is pain to get off.
Funny you should mention the peroxide in the ears thing. I always used it to clean my sons ears and it is still one of his comfort things. When he feels bad he wants peroxide in his ears. My mom recently got hearing aids and they gave her drops to clean her ears. It looked like VG to me and I don't think they did any good. Partly because she is to heavy to really lean her head to the side well. After days of the drops I finally convinced her to use the peroxide and she was shocked at how much better she could hear once we used it.
Funny you should mention the peroxide in the ears thing. I always used it to clean my sons ears and it is still one of his comfort things. When he feels bad he wants peroxide in his ears. My mom recently got hearing aids and they gave her drops to clean her ears. It looked like VG to me and I don't think they did any good. Partly because she is to heavy to really lean her head to the side well. After days of the drops I finally convinced her to use the peroxide and she was shocked at how much better she could hear once we used it.