Actually both HIV and HCV are difficult to transmit, though both are easily transmitted by unsanitary needles. Both can be transmitted from mothers to newborns. HIV is almost entirely transmitted otherwise by one specific sexual behavior  It's very rare that HCV is transmitted through sex and if so, is usually between the elderly with compromised immune systems. Using toothbrushes between persons with bleeding gums might be a way to transmit either. Unwashed hands?  You're confusing Hepatitis A, and perhaps Hepatitis B with the others.