Cleanliness could be a bit of an issue at Schiphol though, I remember not too long ago getting a bad case of "sticky shoes" after walking on some unidentifiable sticky mess covering the entire floor on one particular aisleway. I hoped it was spilled soft drinks given the proximity of a food outlet. I hoped.

Can't remember coming across that problem at another airport to be honest. Though I remember the water of a flooded restroom spilling onto the concourse at Memphis Airport numerous years ago.