Lime away has never lived up to its claims, but i tried in two windows with lime damage from my sprinklers. I reluctantly tried Lime Away, but tested it against 80% vinegar and 20% water. I used a green pots scrubber. The vinegar solution was significantly better, hands down. Not only did it clean the lime from windows with less effort, i only had to do it twice to get the windows sparkling clean. there was no leftover film like with Lime Away.