Omega

I usually clean my Omega Speedmaster Pro with a toothbrush and soap then rinse it under luke warm water. If the gaskets were weak and water/moisture got in would it always produce visible condensation under the crystal? Or could water/moisture get in and ... 

Hi Matt, There's no guarantee that the condensation would show up on it's own, but if you warm the watch with a hairdryer and then place a drop of cold water on the crystal, any moisture inside will condense on the insde of the crystal under the drop. You... 

As to my knowledge, soup can demage the gaskets of the watch. So is that good idea to use the soup while cleaning the case of the watch?

To the best of my memory Omega's cleaning instructions on their webpage says to clean it with a tooth brush and soapy water.