Depends on the behavior with oils I guess.

Water doesn't dissolve oil, although it could help mechanically remove it -- but if the material is actually olephilic or neutral it could be an issue.

I was wondering what would happen if you turned on a firehose and just slammed it for a good length of time...how durable it would be? If they're planning to use it on the surface of an airplane wing -- curious how durable the surface is.