IDK 'The Best' that is usually an opinion battle here , , but the Cyclocross racers when there is Muddy courses and the bikes load up with mud in a lap or 2 that is a common Technique

after the Pro race days the team mechanics use a Bucket and sponges and Brushes .. and a similar wash down ..

Ideal, I expect is set up a cleaning station with everything you need, always there, so it's convenient.