When the poop gets on the grout it is rather hard to get off sometimes. I find that Dawn and a good cloth gets it off though. The rest you can just take of with toilet paper and sanitize.
Thats good to know. I'll be that would be a good job for my little steam cleaner. It puts out a really intense steam about the size of a sharpie which would be able to blast the grout pretty well (in my head anyway).
With a good sealer the grout should (should) be easy to clean. The sealer I used was actually a brush on kind and I'm not sure what it even did really due to it's very low viscosity (like water). I imagine a steam cleaner would work well actually seeing as they are for floors.