If the windows are clean and the interior is clean, (but not necessarily spotless), outside not obviously dirty, you're ok. If you think it's a bit dirty just apologize to every pax as they get in "Sorry the car us not as clean as I normally keep it, but my mom's been really ill and I just haven't had much time lately. I wouldn't even be driving, but if I don't the mortgage won't get paid. Do please excuse the mess."
They'll tell you it's fine and cleaner than some of the other ubers they've been in. And they'll feel bad if they report you then.
Of course, it can't be filthy for this to work.
I have a small vacuum thst plugs into lighter. If I get too much dirt on the floor or the seats it only takes 5 minutes between trips to get it up. Carry a newspaper or paoer towels and windex and tgat and you're good. I also carry stuff for vomit clean up, but even so it takes up very little space.