Had two panes of glass in a split sash window to clean today, i've cleaned them loads of times it's all old single pane glass. Both panes seemed to have mineral deposits on them (the patio had been jet washed) so out comes my expensive Windsol Crystal Clear 550 and I soak both panes. One comes up ok but the adjacent one turns milky and streaky - totally wrecked can't blade it, buff it or wash it off. I think the stuff has instantly etched the glass somehow - anyone else had this?