Dust looking through view finder

Hello All,
Need a little help here. When I look through my view finder I see what I think is dust between my left most AF point and the one just to it's right (holding camera in landscape/normal position).
I fist thought it was on my lens but when I remove it and look through, it's still there.
Then I thought it might be the sensor, so I "rocket blew it". Still there.

What can it be and am I cleaning it in the right location?

TIA

It's probably dust on the focus screen. To find it, take the lens off and look up towards the viewfinder.

Agreed. Since you have an XTi, which is not designed for easy removal of the screen, leave it alone, it does not harm the photo being taken, it only irritates you.

It's either on the focus screen or the mirror. Get a rocket blower (do NOT used canned air,) and blow it out a few times and see if that gets rid of it.

twalker294 wrote in post #7707993
It's either on the focus screen or the mirror. Get a rocket blower (do NOT used canned air,) and blow it out a few times and see if that gets rid of it.

Cannot be on the mirror, as that is totally out of focus!

Thanks for the suggestions. I used the blower and it removed the one offending "hair" but it seems like it put some other debris on there. I tried again and it doesn't want to budge. Is the focusing screen very delicate? Can I use a dry swab (the ones you use to clean the sensor) and gently wipe across the screen?

The focusing screen is VERY delicate, you can mar the surface texture quite easily.

I used a wet swab on mine with Eclipse and wiped it very gently in one direction. It worked really well for me.