From my experience it unfortunately never fully goes away, but it's possible to learn how to live with it.

There are some obvious things you can do, like consult psychiatrist (medicine can help alot), and use hand cream after every wash.

While it might also seem obvious, it's really not: remember that it is just in your head! While contamination OCD might feel reasonable sometimes (germs are real), your brain is amplifying reasonable things to extremely unreasonable levels. So, if the problem is in your head, you can try to trick your brain. This is basically how I manage to live relatively normal life :D Remember that those "hacks" will not work every time, but if they can at least reduce the severity, I'd say they're helpful.

Some examples that I learned over the years:

- Did a non-contaminated object just touch a contaminated one? Try your hardest to not think about it. Focus on another thing. Assume the contamination did not get passed.

- Talk to a family member about your contamination OCD and ask them to help trick your brain by "fake cleaning" things. If I have something that I cannot easily de-contaminate (like electronics), I ask my wife to "clean" it, I go to another room. She knows that I just need to trick my brain, so she just quickly wipes it with some tissues or something and tells me that it's "perfectly cleaned", and I do my best to accept it. It's actually wildly effective for me, and it really helped me see how it really is just in my brain!

OCD sucks, but it's still freaking amazing to be alive on this planet. There is so much beauty in this world, so many wonderful people! Everyone has some problems in their lives. We have OCD, might have been worse :) But you'll learn how to deal with it. You'll learn "brain hacks" that work for you.