>> I live in a hard water area. The window cleaners around here don't use ladders,
>> but long poles, squeegees and whatever they put in the water doesn't leave marks.
>> I can't find what the chemical they add is, but there's numerous products available if
>> you google it.
>>
I also live in a hard water area and have a ladder-free window cleaner. He says he doesn't add anything to his window-washing water but puts it through a de-ioniser as his tank fills up overnight.
Our cars are rinsed with rainwater from the water harvester (large plastic underground vessel which looks like a septic tank). The cars dry streak-free if I'm too idle to leather them off.
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