soak what items you can in white vinegar. Urine is basic; Vinegar is acidic---the two will cancel each other out. If it is a white item that is getting urinated on you can also use pure lemon juice.

You can try to save these items if kiddo is attached to her bag, and you like your slippers, if Abner still pees, then like Lilith said throw them out.

Rug and carpet stains, again I reccommend a high concentration of hot water and white vinegar on a carpet cleaner.

The other thing to do is to change the boxes every day for a week or two.

Hope that helps