Cleaning Slr Cameras Perfect Tool Kit How Do You Clean The Inside Viewfinder Of A 35mm SLR Camera?

How do you clean the inside viewfinder of a 35mm SLR camera? - cleaning slr cameras perfect tool kit

I have a Canon AL-1 35mm SLR camera in an antique shop in my neighborhood, and it has a lot of garbage around the viewer in the camera. I tried not to do cleaning with a cotton swab to clean something. If anyone has any suggestions how to clean and will need to get a professional cleaning, please tell me. Thank you.