sub'd!
interested in this as well!
So when you're cleaning concrete, I understand that there any many different ways you can go about it.
What are some of the chemicals you use and for what situations/stains do you use them?
OK since no one else will chime in...........
If you can rent a lift to go up 6-7 stories and have enough experience to clean these apartments in your youtube video signature............are you really asking what to use on concrete?
perhaps I'm missing something!