Ok so i went on vacation last week and my techs did a ceramic tile job. They ran into some rust and decided T rust would take care of it. Well it left a white residue after it dried and i was going to see what i should reclean it with. When i tried using a towel amd water it went away but as it dried it came back. There is also some hazing that took place i believe due to pre spray drying. We use viper venom powder with citrus solv. Thanks.