you defintiely cant use an iron on plastisol that hasnt been dried.. however you can buy a heat gun/paint removal gun for 25 bucks at a hardware store and use that. they go to like 400 degrees and thats more than enough for plastisol. thing is you have to do it evenly over the surface for at least 3 minutes. what i do is dry it just enough with the gun then put it in the oven. or you could then use the iron.
Ok the spray cleaner is cool becasue i got one thats bio degradeable. it stinks to high heaven though... i just spray and wipe with a rag. simple.. you need good ventilation though.. as far as i know.. flash units do a quick super high temp flash thing ... thats cool but i think they are expensive.
plastisol is defintely not a water cleanup process. i learned that the hard way... you have to get mineral spirits or special ink cleaner. i ended up buying a can of plastsol removal spray, so you spray it and wipe it off. the ink is a bit thicker and heavier than acrylic but it doesnt get sponed up as much hence your whites are stronger. you need to heat cure it for about the same time and temp as acrylic. I just go a little longer and a little hotter than is required.