Cleaned a memory phone mattress last Thursday, which wasn't very dirty, and had a very slight mold problem.
Gave it a very fine misting pre-spray, good agitation, decent dwell time and then extracted with pressure set at around 50 psi. Plenty of dying strokes and left fans on while i cleaned there 2 -1 suite. By the time i left it was just about dry.
Used a cfr hand tool. Would clean not clean any type of mattress unless you have a decent uphiolstery handtool.
Daren