In reply to AlisonH:
I get hacks all the time with my work, I know you probably don't want to hear this but the best thing for hacks is pee, I know it's disgusting but it helps right away. Leave it a few minutes then wash your hands. How you go about this is upto yourself.
I am a plasterer renderer and hacks comes with the job unfortunately.
I wonder how many down thumbs i will get for this.