Post: I did sexual intercourse with many girls. Do I need cleaning everyday for this sin?

It's not a sin to have sex with many girls... and everyone needs cleaning no matter how much sex you had.

It is not a sin and you should make the cleaning a part of your daily routine.
Use suryae and the energy of the sun outside and a lamp (but not a LED) inside in your home for example.
Maybe you mean "detaching"?
Throughout the years we connect with all sorts of partners but they move away from our lives.
It would be good to do a munka working.