Probably some kind of nice shampoo. The Pert I use smells really good and I like Pantene.
Era and Gain laundry soap smell pretty good too. Oh, and I really love that purple Bedtime Baby Bath stuff. Mmm. I can't resist smelling someone when they've washed with that XD.
Come to think of it, there are way too many scents to choose from. I'm not picking a favorite.