I agree with everybody.
Some birds dont love to bathe as much as others do. Took my little Peepers a year before he took his first bath. Others would jump right in and look like a natural. Depends on the bird. I would try giving him a piece of wet lettuce and see what he does.

My birds love lettuce, broccoli and strawberries. Apples are a good starter fruit. Summer time is here where i live and fresh veggies and fruits are plentyful, so every week i try to add something new. Melon ( water melon and canalope) is very popular to the taste buds of my birds. Yes, its hard to find their favorite but they will appriacate it after

I Luv Budgies!