Shopper : Is this solution safe for the focusing screen of a Canon 40D?DAVID G : The only people that can responsibly answer are the Visible Dust folks. You can write or call them and they are generally pretty good about getting back to you in a day or two.JOSHUA H : Yes. There are no harsh chemicals and the focusing screen is far less sensitive than the sensor and AA filter.
Shopper : Why Did You Choose This?wayne m : only liquid I know of to remove oil on camera sensor