I think the real point is that many college age boys aren't going to wash sheets or comforters - they may be getting two or three wearings out of their underwear to avoid laundry

. As a college age girl, I didn't wash sheets or comforters - that was an extra expensive load of laundry! It was more important to wash underwear
For that reason, the Febreeze might be as close as you get to washed linens. But, here is the thing - they are leaving for college. You aren't sleeping in the sheets, and hopefully you taught them how to do laundry - at this point, its up to them.
I have a thirteen year old boy who is "all teenage boy" - in the "droopy pants and ballcap, lifts weights, skateboards, and talks in monosyllables to his parents unless asking for a ride or money." His favorite Christmas gift - down comforter and duvet cover - and yes, he knows what a duvet cover is. Appearances can be deceiving.
(He'd also NEVER get two wearings out of underwear and washes his own bedding).