I have a job that wants the hard water stains removed off of 4 ground level windows. What have you found to be the best method/product to remove tough hard water stains?
I dont do a ton of hardwater stain removal. But i have used a1 from titan labs before with pretty good results. @Johnlee or @Jersey I’m sure could help!
Me neither. I’m going to try since we do a few of their locations and they’ve been good to us. I will look into that @Luke Thanks! 
(They need an emoji with sunglasses and a beard)
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I always start with one Restore. There is no rubbing required you just spray it on then rinse off with pw or garden hose. You want large volumes of water. If that does not remove it I will try A1 or Diamond Shine. You can find them all here https://shopwindowcleaningresource.com/soaps-chemicals/stain-removal.html
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Thank you for the recommendations @Johnlee I will take a look at them.
@Johnlee Did you mean Diamond Magic?
Yes sorry Diamond Magic
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Easy clean, best stuff ever, I had some nasty windows and this cleaned them right up.
I use this during my last cleaning, you don’t want to use your water on other windows when you clean this off. But it’s the best.
I usually scrape first then scrub with bioclean hard water remover and 0000 steel wool. Works on all but the worst which require an electric buffer & buffing compound . I got mine from mrhardwater.com