Viewfinder dust

Recently I noticed a speck of dust in the viewfinder on my K5.
The rocket blower eventually got rid of this.

However a couple more different specs have now appeared, and these will not budge with the rocket blower

I know from previous experience from having the same 'problem' with the K100D and Kx, that these are only cosmetic, and don't hinder shooting or appear on the images (they are only small spots).

I have the Pentax O-ICK1 cleaning stick, could this be used on the focusing screen (which is where I presume where the dust is)?

Or is it best left alone?

Thanks
Adrian

as far as i know you should not touch the focussing screen as it is very delicate.

Dave

Thanks Dave, hopefully it won't get any worse so I'll live with it (as I've done previously)

Regards
Adrian