Am I expected to clean up the house during babysitting?

Hi! I (15F) haven't babysat yet, but I really want to get into it. I'm really good at taking care of kids for long periods of time, but I'm wondering, am I expected to clean up the mess that is there? Of course I'm not talking about the mess I'll make during babysitting, I'm talking about the mess (if there is one) that was there beforehand. Of course, I don't mind cleaning at all and I'm happy to clean anything but would it possibly be seen as weird? Or overstepping?