Bottle and tube cleaning brushes can be used for cleaning drinking bottles and water fountains.
There are a number of safe disinfectants that can be used with our birds. The one we sell in the Budgerigar Club Shop is F10sc. https://www.budgerigarclub.com/product/f10sc-disinfectant-200ml/
Keeping cages, aviaries, birdrooms and feeding vessels clean and disinfected is the way to prevent an accumulation of dirt and bacteria and the transmission of pests and disease to your birds.