Cleaning Glassware with magnetic stirring

[carcrash]

After doing what I can with brushes I normally dump a small amount of acetone + 99 iso into a flask and run the stirbar to get it really clean.  With the flask in a mantle you can rotate around the flask so different sections get cleaned.
Obviously you cannot clean all of the inside of a flask this way, but this helps getting the inside of a flask much cleaner with no effort. Applied lazyness.