IMO, once a week is RIDICULOUS.

Don't ever leave your bird locked up that long.

Our tiel, Charlie, usually has free roam. She's stopped nibbling on cords, and eating things, but she is still watched carefully. I clean her cage at least once a week, and usually much more, because I have fun rearranging her things... I hose her entire cage down once a month... uh... let's see... A tiel needs to be socialized, you can't expect it to be attached to you if you take it out once a week and feed it. Charlie gets covered at night to avoid night scares and whistling... Otherwise, that's about it!