Yes ;)
Too narrow in my case.
Over here the "special stuff" is any cooking oil for a week. Then the ears are syringed with a pulsating water jet by generic nurses, or in extreme cases, suction tweezers under using microscope in a local audiology centre.
I find a daily immersive hot bath followed by reaming out my ears with toilet paper is sufficient :)
OTOH "Otex" (urea hydrogen peroxide) is disliked and distrusted over here, since it can cause problems.There's circumstantial evidence it did for me.
That's the kind of variation that doesn't surprise me.
I don't have an explanation for that. "My" explanation came from the audiologist after fitting. It is not inconceivable that he is wrong.