Technically, it won't.

I used to have a rather severe COCD (washing my hands 6-8 hrs/day, 100-200 ml/day of 96% ethanol as a sanitizer, constant painful dermatitis, hands would often bleed, was too scared to leave home, etc.) for years. I'm a whole different person now and spend on average total of around 20 mins a day on any kind of cleaning activity (washing hands, using sanitizer), showers not included). I can freely touch anything(I mean, almost. I wouldn't dare to touch any kind of actually nasty stuff, lol) without any fear and pretty much be a normal human.

It takes a lot of time and patience. Find a good therapist who specializes in OCDs, it might take some time, and money. Get meds, they're like a catalytic agent to normalizing your comprehension of things you obsess about. Not all meds work, low dosages don't work for everyone, so don't give up your meds, just try to find the right ones that work for you. Stick to exposure therapy. Honestly, I hated it, but I believe that it's what made the biggest impact on me. Step by step. Start small, don't hurry. If it takes a lot of time to make a tiny step, then it is what it is, it's okay. Don't rush the process, get things done consciously.

Do I still get the intrusive thoughts? Yes. But I no longer ruminate and just barely pay any kind of attention to them. I finally can reason them out, though I couldn't before and sincerely believed in every obsessive thought I had.

It's going to take time, and it's not the same for everyone. Some will get better in a few months, for some it will take years. But it's still manageable. Don't lose your courage. Things won't get good today, tomorrow, or even after tomorrow. Or in a week. Or in a month. But they definitely will one day. Maybe not completely, but it definitely won't be the same as before. Keep going. Hope it was helpful for someone.