I consider the rear brakes properly adjusted if you can get them to hold on the first click of the brake ratchet. When I get down to 3 clicks, I know I need new shoes, or my slack adjusters have siezed.
Man, I wouldn't be surprised at what is in people's cars. I have to hold my breath sometimes when getting mileage off of cars. I'll sometimes find rotting food when getting people's spare tires out. Yuck!