I bought the FF one for spraying FF. Never thought to clean it... been like 2 years. I just grab and spray. Not sure that the sprayer itself is anything that fancy, so I'm guessing that, as far as FF is concerned, it can just stay in the sprayer. I just put my FF stuff into a plastic tote and store when not in use.
FF doesn't have a solvent in it, so that won't dry out.