Drinkwell Water Fountain I Have A Question About My Drinkwell BIG-DOG Water Fountain ?

I have a question about my Drinkwell BIG-DOG Water Fountain ? - drinkwell water fountain

I have 4 dogs, and drink very dirty and often cleaned once or twice a week, but there are still some points in some places that I can achieve. Is it dishwasher safe? I also have 3 small brush to help .... For those who work for the really small spaces. Is there something that I completely gone, the things that I can get and still safe for my pet?