Q In ''My Big Fat Greek Wedding,'' dad Michael Constantine uses Windex to cure ills ''from psoriasis to poison ivy.'' Is it a wonder drug?
A Clearly not. The ammonia-based cleaner is ''extremely caustic,'' says NYU dermatology prof Darrell Rigel. SC Johnson rep Therese Van Ryne doesn't recommend it for ''human surfaces,'' but she notes a slight sales bump since the surprise plug. ''Wedding'' star-scribe Nia Vardalos was Win-spired: ''In old-world Greek tradition, you don't use the proper medicine for a corresponding ailment. My dad accidentally got Windex on a wart and it started to dry out, so he started using it for everything.''