This post over at Colin Jago about sensor dust and sensor cleaning was a bit interesting. Personally I clean my 5D using Eclipse fluid and home made sensor swabs made from my old student ID card wrapped in PecPads. Works perfectly fine for me.
From different sources on the net, it appears that the newest sensors are coated with a new type of coating may be damaged by the old cleaning fluid. The confusing part is whether the coating is on the actual sensor, or on the cover glass / anti aliasing filter. If it is on the sensor itself, it is totally irrelevant since you never touch it anyway. I followed the link that Colin supplied to this forum. After reading the first post, I got a clear impression that the new coating was on the sensor. The reason for not using the Methanol (Eclipse) was primarily for secondary reasons. It is toxic, and less potent as a cleaner. It was also said that it leaves more residue when it dries, which I doubt. It was said that the methanol was denaturated, which would leave a recidue, but I can’t imagine why they would denaturate methanol. After all, it is highly toxic, leading to blindness in small quantities, and possibly death. Ethanol for technical use on the other hand, which is ordinary alcohol, is quite often denaturated to prevent people from drinking it.
After looking at the web page of Photographic Solutions, who makes the Eclipse solution. Obviously, they have made a new solution called the E2 which is suitable for the new sensors. This would give the impression that the coating is on the cover glass. Hmm, difficult to draw any conclusions.
Anyway, the forum thread doesn’t really answer the important question: Will any of the solutions permanently damage the surface of the cover glass. Whether a fluid leaves some residue is not really that important. If it does, change to a different brand and clean it up.
For me, the proof of the pudding is in the eating. My sensor cleaning technique has so far been very successful, and as long as Photographic Solutions has enough faith in their product to offer free sensor replacement in case of damage, I feel quite safe. Well, they won’t replace my sensor of course since I don’t use the recommended tool, but the cleaning fluid is the same. If I change to a newer camera some time, I may just buy the E2 fluid to be on the safe side.