Cleaning brand new grout in shower

So, here are the dirty details - I just had the shower in my master bath renovated - beautiful pebble stone floor with "Snow White" grout - it was sealed as it should have been....and then my cat deceided to poop on it while I was a work - the contractor, bless him, cleaned up the poop, but the stain remained - i tried cleaning with a clorox based cleaner followed, the next day with Kaboom....stain is still there, although just a hint - any advice anyone?
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