Ideas from Jeanna:
You can get disposable electric toothbrushes at the dollar store now. It’s amazing what a great job they do of getting gunk out of crevices — takes far less work than with a regular manual toothbrush! I like to put a little softscrub on mine, since it has bleach in it and a thick consistency that sticks to the brush like toothpaste, and scrub out all the hard to reach places as well as spots like tile grout and the base of faucets.