Papers on the bottom of the cage should be done daily, if possible. With my pigpen 'bird' I do it several times a day. And the tray is done weekly.
Most veggies can be washed, the only thing I cook is sweet potatoes unless I'm freezing them. Then I blanch them according to my cookbook directions.
Cooking beans like pinto, chickpeas, black beans, lentils, split peas and whole grains like whole wheat, steel cut oats, spelt, millet, Bulgar wheat according to package directions. I do that about every other month and freeze what I'm not using for immediate use. Use fresh fruit like apples, pears, bananas that have been washed and diced into tiny pieces.