how do you wash towels by hand? is it hygienic?

I personally wouldn't do it... I would just go to the laundromat but if I really had to do it If you have a bathtub, fill that with very warm water, or hot water if you have gloves, add detergent and squish towels around soapy water agitate the towels in the soapy water with your hands until you know its clean. Then you can let the water out and fill it back up with clean water and rinse the soap out of the towel then squeeze all the water out and hang to dry or throw in the dryer... Good luck!

Hand washing will not ne as effective as machine washing, but still may be enough especially depending on the soil level.