cleaning inside the camera

for the day when eventually something gets on the angled mirror in the camera, what do I clean it with?

LCD/plasma screen cleaning liquid and a q-tip?
lens brush?
the other end of the lens brush to wipe of dirt?

something specialised? if I use any of the above will I damage it?

I'm not talking about the sensor here, but the angled mirror.

Nothing. Never touch the mirror or mirror mechanism. If that gets out of alignment so does you ability to manually focus and see when the camera is focused properly.

In a camera's lifetime you should be able to get by without cleaning the mirror. Odd specks of dust won't have any effect on the image itself.

Yeah I don't think the mirror is a focal plane so like, for example, the lens front element any particles on it won't affect the image.

John's advice is spot on.

Unlike your bathroom mirror, where the silvering is on the back - with a glass surface facing you, the reflecting surface on an SLR camera is on the front and is incredibly easy to damage. A cotton bud will scratch the surface so will a lens tissue!

A gentle waft of clean, dry air is all that can be used to move dust. This is best done with the mount facing down so the dust has a better chance of falling out of the camera. Never be tempted to blow on it, far too much moisture in breath. Rocket blowers tend to blow dust around in the camera. The dust then finds something else to land on, like the sensor, the viewfinder screen or even up onto the prism.

Best defense to dust inside the camera is to keep it closed! Change lenses quickly and always with the mount facing downward, less chance of gravity helping dust to enter the camera. Avoid changing lenses in a dusty atmosphere and keep caps on as much as possible.