I'm sorry to hear you have such awful neighbours. Have you tried contacting your local council environmental health department? I would tell them you have reported it 5 times to the police & twice to the mp.
Like you, I cannot understand the mentality of some people, why people think they are invincible ( which clearly they do) and think it won't affect them and that the law is for everyone else except them. What part of death don't they understand?
I am constantly washing towels, my husband has his own of everything, he even keeps his toothbrush in a bag in our bedroom, unfortunately we don't have 2 bathrooms but if I did one would be solely for him. This virus terrifies me. I'm always cleaning door handles, light switches, remotes, telephones etc.
I hope someone will listen to you and take action.
Stay safe xx