Some less relevant life questions

I've been struggling a lot with the big questions recently. Y'know. Things to do with life and death, with careers and relationships. In amidst this, some small, less relevant (but by no means less important!) questions have come up.

1) Dry cleaning...WTF
What on earth happens to your clothes when you take them to the dry cleaner?
How can you clean something dry?
My version of dry cleaning consists of scratching off the dried food or mud on my jeans with my fingernail. Is that what happens in a dry cleaner? Do they have troops of picking monkeys just...scratch, scratch, scratching meticulously?

2) How long do you have to wait before pooing in a toilet which has been freshly cleaned?
What is the etiquette? I want to know.

3) Do people realise the magic combination for not having a bad outing ever? Doesn't matter who you're with or what you're doing... you're just not going to be fun if:
a) you're hungry
b) you're the wrong temperature
c) you have the wrong shoes.

We need to spread the word.

4) Why aren't car windows like... one way mirror-thingy viewers?
Then not only can no one peek in your parked car for things to rob, but you can enjoy your little bubble of privacy when you're at a red light. You can sing loudly and animatedly without having to endure the ridicule of those around you.

...just some little things