I vote with Watermom on this one.....YOU need to insist to your wife that either you guys do the alergy testing in the tub now or pay some doctor to maybe get it right in the future. Not trying to knock down allergy testing at the doctors office, it's just that you have more riding on finding the problem than they do.... It may seem your making your daughter into a lab rat, but I also have a 4 year old girl that has highly sensitive skin and since I have gotten my chemistry better and better, her rash/skin issues have gotten better too. Your case seems to be a bit more "extreme" than mine and that's why I will also formally recommend you do the tub testing.

Some of the best fun in the world as a kid is splashing around in a pool. Make sure and emphasize this to your wife.

Bob E.