A:AnswerThe four blades are for mixing liquids like frozen fruit, fresh fruit, milk or protein shakes and it is used with the tall cup. The two bladed attachment is for nuts and maybe coffee and it is used with the short cup. Anything dry. Hope this helps.
A:AnswerIt says in the book, not to put it in the dishwasher. I would imagine it could dry out the washer/gasket and cause it to leak. I just rinse it off real well as soon as I use it ans wash it with a soapy sponge.