Small Projection Screens Is There Any Practical Way To Clean The Inside Of The Screen On A Rear Projection Tv?

Is there any practical way to clean the inside of the screen on a rear projection tv? - small projection screens

It is really annoying little black dot in my rear projection screen and I think it's on the inside of the screen. It seems a notch in front, so I think he has something stuck inside ... hmmm, I want you gone.
10 points to someone who knows pointer fees.