I have no trouble cleaning my blades at all. I remove them after each cooking session. Bought a thin bottle brush and it does the trick whilst I hold it under running water.
Potatoes are best cooked in the basket and only mashed in the bowl, no cooked-on mess to clean up and if you soak the bowl whilst you are eating your meal, that helps too. I never leave it just sitting there, I either clean it immediately or at least soak it for later.