Why should I use paper towels instead of rags? Won't paper towels leave fibers behind?

Both of those options will work, although including the unit number on the street line is preferred.

Your best bet is to try and quickly get them out when they don't expect it. Alternatively, just try to safely speed away from them.

Yes, that should work the same as toilet paper.

You should wash the rags in the laundry or manually unless they are already clean.

Yes, you can, but I personally soak the towels with water before dumping them, it makes it safer and there's less chance of combustion.

You can, it just won't be as flexible when you fold it. I'd recommend not adding stems, as that will put more weight on your flowers.

I don't think you should use a cast iron pan but it could work if you are desperate. I would definitely use a gas stove.

Air fresheners are unlikely to be a danger in your car. Although materials like felt are flammable, they won't get hot enough to catch fire.

Tape will not last as long as glue, especially a glue made for paper. There's no reason you can't use origami paper, though.

It's possible that your issue with scum marks isn't due to the soap you use, but rather the water. People who have hard water tend to not be able to...