Just remember it's your word against the guy or company who pays you. If the manager calls corporate who signs the check and says you didn't show up , and you have no proof without a signature on paper you can get the shaft. I have the guys take pictures of any job they do, for the before and after. The reason is there is no one around to sign the work performed line at 3.00am or on. Most of us have to clean commercial in the early am to avoid nosey customers and work more proficient. So we take the pictures just for the fact that if there is ever a question later, or also because of our recovery practices we take pictures of the recovery for us and our clients if later someone says we didn't do what we were supposed to.
Example in my terms and conditions for contracts if the customer does not pick up the garbage and keep area free for cleaning they will loose us and have to pay the remainder of the yearly balance. This has happened with one franchise of restraunts. Four of their stores lost us do to the fact that every time we went to clean the employees would leave Garbage bags ripped open that didn't make it into the dumpster, and broken beer bottles, and even garbage cans all over. They were warned and it continued once more and that was it. I called and they checked into it. Of course the managers denied it happened. So then the camera was downloaded and there was the evidence. Employess were in a hurry to get home and didn't care where the garbage ended up. Needless to say we were promptly payed by four of the stores the remainder of the yearly balances per contract. So see the camera is your friend and should be kept with you on all jobs.