I love my blender system!  Immediately after making smoothies with the cups I always place the lid with the blades in running water and clean with soap and dish brush before I do anything else. I noticed dried gunk on the rim of the mixing cups after making smoothies. I carefully removed the rubber gasket in the blade lid and it was so full of nasty gunk - very sickening.  This is/could be a health hazard and needs to be addressed. The gasket is very hard to remove and clean....  I already cleaned or I would have added a photo showing how nasty.