Germs live everywhere you can find germs everywhere, Most germs wont harm you , your immune system protect you against infectious diseases, 

The best practice is a two step cleaning process, first clean surfaces with a general cleaning solution to remove the visible soil, then go back with a disinfectant to kill any microbes that remain without first removing the dirt and debris the disinfectant can not do its job to kill bacteria and viruses

When cleaning residential and commercial setting use the special operating procedure done in medical set up use proper PPE use medical grade cleaning solutions and treat any bodily fluid to be infectious and after the cleaning disinfect all equipment and dispose garbage properly as medical waste.