I have found that a product called Simple Green will take out the
block out resist, Also Mr. Clean, but Simple green is better. You
have to scrub with a fingernail brush and water. (we do it on the
table top). let it soak for about 30 mins, then scrub again. It is
alot of work, but better than restretching the screen again and again.
If anyone has worked with photo emulsion I would like to hear about
better ways to do the exposure (without a fancy exposure unit). The
photo stencil comes out very easily with the stencil remover.