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Do you think I'm being sabotaged at work, or am I being paranoid?

I work for a commercial cleaning company. One of the buildings I clean is the bank. One day the bank manager left a note behind for me asking me to dust the teller line and desks and that it was very dusty. She was right so I dusted them. A couple weeks later she left another note asking me to dust the teller line again. Thats all she said about the teller line, and nothing else. It wasn't even dusty but I went over it with a duster. There are some areas that are impossible to dust without moving anything and our policy is to never touch or move anything. I ask my boss if she could inform the bank manager of our policy. She did but then the bank manager asked my boss if I could dust the computers and monitors. That was NOT on the note or the list and I got the impression that's what she was trying to tell me to do the entire time. I don't know, i feel like this manager is just trying to get me fired. I walked into the janotors closet just now were just anyone has access to. I use one of those mobile trashcans you see janitors using on the wheels. It's like a platform which wheels on the bottom. Someone took that off and put it on top of the trashcan. A lot of my stuff was knocked over too. I called my manager to see if they were in the closet. She is the only one besides me who has any business being in there so I think one of the banks rmplpyeed were in there and messing around. Does it sound like someone doesn't like me?
Do you think I'm being sabotaged at work, or am I being paranoid?
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