whys that anyway chris?
I was just curious how some might price it because I too have only ever done one of my windows at home with MDR and that too took a while to do,
I would think an hourly rate would be the way to go starting with a minimum 1 hr starting price, not sure how you would include material costs, a bottle may last a long while
I have however had a window on a farm that was covered in calcium deposits which came off on its own with wfp/pure water over the course of 2/3 cleans this window was so bad when I fisrt was shown round the farm I thought it was frosted glass until it started to come off whilst cleaning for the first time (shocked for a minute there)
The guy was well pleased at the time