When you take a mop in your hand you become invisible. You can move around without anybody noticing. I wanted to do some cleaning wrong time and some wrong places "Excuse me, I'm sorry, Excuse me, I'm sorry, could you move a bit please...?". It succeeded even better than I expected! Afterwards people told me that they had been a bit annoyed to see that the cleaning personnel of the museum didn't understand that it was unsuitable to clean when a curator holds a speech...
People started to realize that I am not a very serious cleaner when I started to blow soap bubbles and dust places with a glitter-powder.
Then I asked people to write down on cleaning wipes a thought or two that they wanted to get rid of. I promised not to read them and throw away all the bad thoughts.
The thoughts were attached to my cleaning trolley. In the end, the trolley was full with wipes with thoughts!