Visible Dust Focusing Screen Swab
Tailored for those hard to remove spots off of your focusing screen the Focusing Screen Swab™ will, with the help of Visible Dust’s fine array of liquids, remove any undesirable contamination. With its specially designed 45 degree angle swab head, the Focusing Screen Swab™ fits into any DSLR to clear your sights through your viewfinder.
You also need Visible Dust Sensor Clean cleaning fluid ( item # VD-SC ).