Yes. Sewer gas can come out through the opening on the inside of washing machine. When the clothes enter in a washing machine, sewer gases enter and this gases are generated by microbes. If these microbes remain trapped in a dirty clothes, then it acts as a breeding place for germs like viruses. These viruses will infect your house and you may have flu or cold or fever depending upon what virus is there in them. This will damage all types of electronic appliances like computer, washing machine, cell phones etc..