When I had acrylic tanks it was recommend to get the Ammonia free version of the Windex. Have personally been using Windex on all my tanks without any cloudiness or crazing on glass and acrylic for over 10 years. Just my two cent
I spent $$$$$$ for my custom built acrylic tank and don't want to risk the crazing and cloudiness that some people have experienced. Water and/or Novus for me. Call me "chicken" if you want....
