Washing your hands will not help if your phone is contaminated with bacteria! Studies show that smartphones can act as a "Trojan horse" for various viruses and bacteria.
It is a good idea to actively clean your phone to decrease the risk of infection and for this purpose UV-sanitizers have been created.
UV-sterilizers clean your smartphone and other small, non-washable items such as smart watches and jewelry from bacteria quickly and efficiently with UV light. UV light technology removes up to 99.90 % of the bacteria.