What's the best way to remove hard water stains from the side of your coach? I get some periodic dripping from refrig venting and from roof air conditioners that run down the side. Leaves a white stre...
If it's condensation from your A/C, that would not be hard water. Condensing water is about as soft as it gets as it's nothing other than what's in the air. The water then drips and runs across the roof picking up junk along the way. The rubber roof's are most notable for causing the white streaks on the sides of RV's. Once you get the sides clean, keeping the roof cleaned and sealed is a better long term solution.