Have you tried putting a mirror into a very shallow dish filled with warm water (not hot). Although I generally avoid mirrors, I found that putting a mirror in a shallow dish (Like the tray under a plant pot) worked very well - also sprinkling something they like if he is into a veggie like broccoli.
I used to use the shallow dish and put it right up to his perch and hold it there for him and he would hop in - i know some people would use a clip on spare food dish and clip it near his favorite perch. I think you want to keep it up high, not down low.
Now my keet just flies over to the sink when he wants a bath from the sink - i forget how we started this, but he was clearly curious about the running water, so i put it at a dribble and cupped my hands palms down to let him sit on the back of my hands and he prefers that most of all.
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