@MarcusAnthonyCyganiak well damn...
I would think you know this already.
However, the "waterproof" seals on these devices aren't permanent and the chemical abrasives in soaps can, and probably will, damage those seals over time. When the seal is broken, water will get into the phone and ruin it.
It obviously hasn't happened yet, but it definitely can, and probably will happen at some point.