Hello, yes. This would be irrational fear. I can explain why it is but know that what ocd craves is proving or disproving something. So, I'm actually feeding your ocd by doing this. But in the shower, there is water. Rinsing everything away. And so, no precum is left. And in the off chance that there is, it's harmless. It doesn't do anything. And your fear of it going through the flor and contaminating your bed. Not possible. You need to go ahead and realize that this is a serious issue if you are irrational and having a phobia. Do you see a psychologist? If not, please do. This is treatable. Exposure therapy is the best for this type of thing. ERP therapy is what it is called and it is the gold standard. Medication helps too. Are there other things you have irrational fear about?