AlbaChem Citrus Screen Opener instantly unclogs any screen while still on the press. Dissolves most types of ink, fresh and old. It is made for use on photographic stencils or water soluble hand-cut film only. Benefits: Instantly unclogs any screen. Use while still on press. Works on all types of ink, fresh or old. Great for spot clean ups. Leaves no film. Directions for Use: It is not necessary to stop printing when using Citrus Screen Opener. After a squeegee pass, spray onto clogged area from a distance of 6 – 10 inches. Screen will open after 2 or 3 passes of the squeegee.