Hygiene =)

Hygiene is not as hard to maintain while homeless as some people might think. Bird baths are essential daily for cleaning the parts that mainly need to be cleaned. You can use your hand as a wash cloth in any single person bathroom, in order to scrub your arm pits with soap and water, which takes less than a few minutes to do so. Also, the other parts of your body can be cleaned the same way, which means that you can be in and out of the bathroom in less than 5 minutes or before someone would even notice what you were doing in there. Obviously if paper towels are available those can be used instead.
Shaving your face can also be done relatively quickly, maybe in 5 or 10 minutes tops. All you need is a razor blade, some conditioner to lather up your skin, a small vial of shaving cream, and obviously the water form the sink to wet your face beforehand. With these items though, you can prevent shaving burn, you can get a smooth close shave, and you can toss them all back into a bag and head out of the bathroom before anyone notices that you shaved. Just make sure to quickly rinse the sink out before you leave so that you don't leave a trail of evidence so that you can return whenever you have to shave again.

Some places even have electrical sockets in the bathrooms themselves, so look for those in single bathrooms in order to plug in your electric shaver for your head or for your face. That is an even faster method of shaving or cutting your hair and it can come in quite handy for when you are pressed for time.
God Bless