How do you clean miller moth stains from curtains?

Put a little "Clorox clean up" on a wet sponge and wipe it away. Even if your window sash is wooden with a nice stained finish, the Clorox clean-up won't hurt it as long as it's diluted w/ water and you wipe/rinse it all off after the stain is gone. I clean all my window sashes with this because it works really good, really quickly, with little scrubbing. Also, bleach kills mold (which likes to grow on Windows) and discourages mold growth.