Originally Posted by INDY GS
Spyderjons technique is the best I have found. Use a suitable Rubbermaid type container one that will fit the area of your brush. Fill it bristle depth with citrus base cleaner to disolve the wax build up. Then rinse well with clean water. Let dry. Use again.
I took some tuning 'lessons' from a gentleman very knowledgeable in this stuff.
His tuning techniques absolutely blew me away.
He has two brushes, his clean brass brush, and his dirty brass brush. He uses the dirty one for cleaning the bases. The clean one for finishing off after a clean wax. He cleans his brushes at the end of the season using base cleaner as mentioned by the others.