Here's a product that I've been using for several years -
Kleen Green Naturally Enzyme Cleaner
I use it to sanitize the counters in the kitten rooms, the litter boxes and the occasional kitty accident.
I buy this by the gallon in concentrate form, and it lasts me for months even with all the cat and kittens I have.
For those with a kitten or two, the 16-ounce concentrate would be great.
If you want more information, check out this link:
http://www.naturalginesis.com/products_kleengreen.html