I had a rather bizarre experience today as I waited for my seattle to amsterdam 232 flight. There was an announcement 20 minutes after boarding was due to start that there had been a 'spill' on the airplane and the outgoing flight was delayed while they looked for a steam cleaner to clean the airplane. They instructed all passengers in row 29 (exit row by the lavs) to come to the desk for seat reassignment. Although they did not announce this to the general public, the 'spill' was some sort of overflow from the lavatory. Yuck. 2 hours later they invited passengers to board the plane, but cautioned passengers that there might be a smell on the plane and that people could change seats once the doors closed if they wished. I'm not sure why they didn't just swap out the A330 with another plane instead of having a potential public health risk, regardless, not the best way to start out a 9.5 hour flight!