Easiest way to adjust the rear drum brakes is to put the brakes on while going in reverse - the little "star wheel" will ratchet the brakes to the point where they start to touch as Rowa indicated earlier.
For best results, try hitting the brakes fairly hard after getting up to 5-6 MPH in reverse a few times. After you do this, try the ebrake again- it might save some time and extra hand washing. The brake spoon (adjusting tool) or flathead screwdriver works too, but it requires bending over - for us old folks that isn't as much fun
