I am not full time yet. Technically. Thankfully. My voice is dead.
I've got this stupid head cold that has nestled in my throat and it has lowered my voice down to lower than I used to talk as a boy. And I missed work today because I couldn't really function, but I've got to work the next 3 days. I have no pressing need to pass, technically, but I'm worried about the un-training that comes from a week or so of having a sick voice. My job involves talking, sometimes for very long times without a break.
I'm guessing the answer is just deal with it and try to resume normal habits afterward, since there doesn't seem to be any way to really clear your throat out of crap except for time and nature.
I was amused as hell when a hospital called today looking for my mother, and the lady on the line ma'amed me despite my congestion. She asked me to identify myself and I said I was the patient's daughter.

... which is actually the first time I've ever used that word to refer to myself, despite a few other people having labeled me as such already.