Wash your towels in hot water with a cup of vinegar, then run again in hot water with a half-cup of baking soda. That will strip your towels from all of that residue & mildew smell & will actually leave them feeling fluffy & smelling fresh.
the reality is you will grieve forever. you will not 'get over' the loss of a loved one; you will learn to live with it. you will heal and you will rebuild yourself around the loss you have suffered. you will be whole again but you will never be the same again. nor should you be the same nor should you want to.