Hey guys, I think all this cleaning of lens stuff is well over the top , I clean my Tak and the other accessories Taks with a OPSM glasses cloth, with a very small spray of normal Windex, been doing this for years.
Crystal clean every time, and no smears, and no damage,save your dollars.
Did you know that when one takes out the filter in front of the sensor of a 5D, that they are nearly indestructable.
I tested mine that I took out because I did not need it any more as I replaced it with the IV/UR replacement.
I took it to the shed dropped it in acetone, metho, petrol and kero, rubbed it clean, with an old cloth, took it inside washed it under the hottest of water with dish washing detergent and dried it with a tea towel.
Not a mark was visible, but I'm sure there were some small marks that I could not see.
The point is you can handle filters and the like and clean them with ordinary stuff, they are much tougher than led to believe.
Below is an image of the filter I removed and abused with a bright light shining through the rear
Leon
