This must be the week for it! We had a similar situation at the candle shop. Still haven't figured out for sure exactly how it happened as it hadn't rained. Had to be from the water hose near the front door, but still weird. Luckily nothing was damaged except cardboard boxes. But mopping up and getting product out of wet boxes and into dry ones took half the day. Like you we had intended to do major cleaning but not that way! And not till next week after we had all Jerry's stuff for the New York Renaissance Festival out.
Now take a deep breath and be thankful you found it before everything got ruined! Then go take a nap.