Marc completely ignored the most important aspect of bird husbandry. He carefully cleaned the cage and left the birds filthy. Birds like to bathe every day to remove the encrusted preening fluid on their feathers, they then reapply fresh preen. The birdbath in my garden is used so much I have to scrub it every day - a wide variety of wild birds.
I feel sad for those poor budgies who have to remain filthy all their lives.