My dryer's lint screen comes out of the top of the dryer. I pulled it out to clean it, and a little rubber ball fell into the slot. I can't see it, can't get to it. I pulled the dryer out and tried to feel for it through the venting but we can only get so far. Laundry is backing up, any ideas?

Try to pop open the flat panel below the door. Many dryers have a removeable panel held in by spring clips.

You have two options. Try to remove vent from rear of machine, the ball should be there or call a service to come in and clean your vents out. I like the second optiion sice very rarely does anyone actually get these vents cleaned. They can be a co and fire hazzard if they are stuffed or blocked in anyway

I usually use my vaccumm and it's flat attachement to clean mine out. If it is within reach, the ball should stick due to the suction.