Burke may have had a little point about cleaning surfaces. But only for high gloss paints. With latex, you can successfully clean every surface with your paint brush, and you never have to touch water and detergent again. But today I painted over a door, and I must say, high gloss paint does not take at all, on greasy surfaces. A bit of a disappointment.
And a little warning: directly after painting a door, open that door. Because if you paint over locks and hinges, you may never have the chance, again.