Spot in Viewfinder

Can anybody suggest a way to clean a spot inside the 70D viewfinder? It is not on the sensor (the shots are clean, no spots), and not in the lenses (I have a few). Air blow did not help. It is harmless, of course, but irritating!

It's probably on the focus screen. It will need to be carefully removed and blown off.

Focus screens can be removed, there are also ways of at least blowing some air into the viewfinder "channel"...

So I take it there is no other way besides removing the focus screen. Blowing air did not help.

Lbsimon wrote in post #16848894
So I take it there is no other way besides removing the focus screen. Blowing air did not help.

Blowing air can make it worse sometimes. Just leave it.

Frodge wrote in post #16848991
Blowing air can make it worse sometimes. Just leave it.

This. It's going to happen and it doesn't impact image quality. Why risk causing a real problem?

I got dust in the VF of my T1i while futzing around with the focus screen. I tried a Katzeye and didn't like it and then got dust in the VF changing back to the OEM focus screen. I pulled the focus screen again and tried using a rocket blower to clear it out, but it just moved the spots around. Not sure there's much you can do about it.

I would first try to clean the outer side of focusing screen - the side you can see, when you remove the lens. Most likely the dust is there and not on the inner side. I would use small (narrow) soft cosmetic brush.
First read the article, how to prepare the brush: http://www.prime-junta.net …/a_Brush_Your_S​ensor.html
Then locate the dust spot and gently remove it with the brush. You won't scratch the focusing screen with a brush. Just do it with a feeling and steady hand and be careful not to touch the mirror with the metal part of the brush.
Dust in the viewfinder does not affect the picture but it's very annoying.

Here is a guy who cleaned the focusing screen and the mirror on his Nikon D300s with Eyelead gel stick: http://www.youtube.com​/watch?v=fetJfPILU3o
Gel stick was not meant for such jobs but apparently it works. The same did the guy on Nikonians forum on his D800 and there was no damage to the focusing screen and the mirror.
Well, I wouldn't touch the mirror with the gel stick, but I will for sure clean the focusing screen when the problem appears on my D7100.
If the spot really bothers you and you don't want to mess with it then take it to the first Canon service. They will clean it for you.
Regards

If you can't put it off with one or two soft blows from the rocket blower, leave it alone. Unless you want to take he screen out and carefully clean it. Believe me.

If you can't ignore it, send it to canon or a professional shop. Not worth possibly screwing something up.

I just cleared some dust from my viewfinder. It was sitting on the focusing screen, but it was easy to blow away once I had the screen outside the camera.
Now it's clean again.
This is of course much easier to do on cameras where it's intended that the user should be able to replace the focusing screen himself. If you then have Canon's special tool for this, then it's a breeze.

I did use air, and it blew away most of the spots. But the biggest one, right next to the focus center point, turned out to be stubborn! You are right, it is not on the shots, just annoying.