Thankfully, she didn't laugh or mock. Instead, her smile was understanding; her questions were professional and to the point. Severus was growing less uncomfortable by the moment.
"Usually twice a day, sometimes more if there is something particular I have to do after work. I don't like to feel as though I carry potions fumes with me wherever I go."
He reached into a pocket and withdrew the bottles of shampoo he'd been using, all of them promising to 'control oil'.
"I've also tried vinegar, talcum powder when it's dry after washing, and ethyl alcohol without any improvement. It seems to have some drying effect - the ends are so brittle - but the scalp oil is just perpetual."