@ EricD - hello and welcome. First thing would be to confirm that CLR is safe for glass and then get an MSDS. Take the time that it took you to get the first panel cleaned up and then multiply by the pane count based on that time. Add a little extra to account for supplies, materials, etc… Chemicals, PPE, towels…
I would find a water source near the building and check their TDS with a meter. The water staining is from the recycled sprinkler water? If you can get enough water in a sample bottle take it to a pool supply and have the water tested. They will tell you the make up the water and you can then look for a stain remover that is suited for the buildup, IE calcium or sulfur or whatever.
Once you determine the type of staining involved and the effort needed to remove it, call your window cleaning supplier like WCR or whomever you use and ask them for a recommendation based on known facts you have in your hand.
There really is no one size fits all for stain removal. I have tried most of them with varied results on different applications. The key is knowing what the stain is and hopefully how long it has been there. I hope this helps and best of luck.
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