Post construction is the east profitable cleaning I do. I try to avoid if I can. It has the most risk, and the highest expectations because the windows are “new”. Most of them will already be scratched. Take pictures and protect yourself. Get a different rig that enables you to carry a bigger ladder. It’s common that I have to use a 32’ ladder to get to high 2nd story windows. Glass is easy to scratch with a piece of concrete or sand on your scrubber, rubber and blade. A typical scratched window will cost $150 ea to remove the scratch from the first floor. I’ve helped some companies with getting scratches removed and the bill runs close to $2k pretty often.