I wash pieces a fat eighth and smaller by hand, place the wet pieces in a mesh bag and spin in the dryer, then hang on a line to dry.
I use Best Press as my starch, and spray yardage before cutting, and during block construction. I have to use a very lightweight iron, and I think spraying seams during construction helps make up for the lack of weight.
I'd like to try traditional starch some time, but the spray kinds have the type of sprayer I'm not able to use, and using the non-spray kind sounds more complicated, so I haven't tried it. The Best Press is so easy, LOL!