Last week a local guy that pressure washes homes in the area washed the neighbors house (vinyl siding) with some type of mixture that he sprayed on, then came back 10 minutes later and rinsed the area the he just treated and the mildue washed off like it was dust. I ask, but he wouldn't give a hint to what his cleaning solution or mixture was. All I can say for sure is it had a chlorine smell, but the chlorine wasn't what cleaned the surface, it was something that caused the mil due, etc. to just rinse off. Any ideas would be most appreciated? Thanks - Ron