I have used a little brush, as in a tooth brush or small brass wire brush like a Hush Puppy shoe brush only smaller, and air hose to very carefully blast the stuff out. The higher the air pressure, the higher the level of care. Really, I know how not to do it. Sometimes just a dryer sheet softener thing works to rub across the screen. That said, I haven't really looked at my new fantastic screen yet to see if it can pop out easily. I just like blasting away stuff with the air hose.
kevin