I have always cleaned the Shaker by hand, never came into the dishwasher while hairline cracks formed after a short time on the cover. Mir was also the material so unstable before I never took him go for fear it could leak or break something.
The lid and screw cap is very unwieldy and useless in practice. Thus, the screw cap for the drinking opening is very flat and open and close quickly is not given. The thread tilt so often that it just sucks more especially since you often do not immediately see, then starts to shake and then the mess is everywhere. On the tightness of the cup can not be relied upon. That may indeed be with each cup so but at this is by design, the probability that it is leaking far higher.
Hygienic, the cup is under all. The screw thread of the cup are so fine that it is accumulating lots of debris can be removed only in fine working with brush and sponge. The material also takes in the long run to the scents shakes. The insertable sieve I also unhygienic, tedious to clean and annoying in the long run when inserted.
Meanwhile, I'm on a shaker switched the wide screw for fast opening and closing, has a scroll ball instead of a screen, a click closure instead of a screw and the material much more stable and leak-proof effect. Did it almost twice as this Shaker spent here but it was worth every euro.
