First off welcome to the forum. Its good to have to here and congratulations on your Omega.

I never cleaned an Omega, but I would simply clean it the way the manual tells me to. The water never messed up the fiber optic sights on my rifles. But then I do not leave them soaking in it. I use hot water and dish soap to clean the major fowling out of the barrel. I still use solvent patches to get the rest of any fowling the water might miss,out of the barrel. I am sure an Omega owner will tell you their secrets for cleaning. Perhaps there are special parts you have to pay attention to with that style action.