All those nutritious, delicious smoothies can bury your blender in gunk. Goo. Goop.
ICK.
For a quick and easy way to clean after each use:
Fill the blender half-way with hot water.
Add a few drops of dish soap.
Cover and run for 10-15 seconds.
Check the inside cover for residual gunk/goo/goop. Run a few seconds more if necessary.
Rinse well and dry.