I keep a paper towel at hand at all times! His poops aren't runny, so when he does, I just quickly dab it up. I go over the keys with a cleaner at night, just to get any residue.
My birds love to snooze on the keyboard too, your tiel looks just like my Newman. I bought a keyboard skin on amazon to protect from dander, dust, or poo. It just peels on and off, and you can just rinse it clean.
[ame=http://www.amazon.com/Aluminum-Unibody-MacBook-Silicone-Keyboard/dp/B002TPL260/ref=sr_1_1?rps=1&ie=UTF8&qid=1360877690&sr=8-1&keywords=keyboard+skin]Amazon.com: GTMax Aluminum Unibody Apple MacBook / Pro / Air Silicone Keyboard Skin Cover - Black: Computers & Accessories[/ame]
I keep tissues handy too... you never know!