As Newcouple has said above, there will always be -something- in there, the rectum is made of porous tissue, so there's no way to clean it entirely. Have her use the bathroom beforehand, clean herself in the shower, and try an enema if you like. Condoms also make cleanup nice and easy!
Remember - lube is your friend! The butt does not produce natural lubricant the way the vagina does, and if you go at it without adding some of the slippery stuff, you risk discomfort and possibly injury to your gal. I recommend a good high-quality lubricant, something silicone based is even better because it will last longer than water-based.
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