I know this topic has been discussed ad nauseam, but I found two small nylon brushes that allows you to get into the nooks and crannies, if you are so inclined. I put these in a cordless drill, but a die grinder work just as well. Use with lots of Simple Green
Both available on Amazon.
Dremel 405-02 Nylon Bristle Brushes
Dremel 404-02 Nylon Bristle Brushes