I have had terrible luck with cleaning my buds in recent years. My first set of Bluetooth buds had a mesh grate and no rubber bit (don’t know what to call that bit that holds it in your ear) meaning that I could kinda clean it with a cotton swab but it would miss a lot because it was effectively trapped behind the metal. The other two have had a sort of cotton stuffing in the audio channel that I have to be super careful to not pull out while I clean it.
My assumption is the first poster is a reference to this classic song from the musical, “The sound of music.”
en.wikipedia.org/wiki/Do-Re-Mi
(“Doe, a deer, a female deer”)