Was about to buy Eclipse cleaning fluid to get rid of some fingerprints on my 5D mk2 mirror when I came across a post somewhere (google it) that the Eclipse fluid might just be high grade methanol. Since I happened to have 90% methanol I decided to give it a try. Grabbed a couple of q-tips and did it. Tried it first on the edge of the mirror and seeing that it worked cleaned the remaining surface.

Worked just fine but left a few small specs of residue. The fingerprints (don’t know how they ended up in there) were causing severe light scattering on the viewfiender and probably messing up the focusing. Not there anymore!

If you come across this post and decide to do it yourself I am in no way liable! You’ve been warned!

I should have taken before/after shots…