Hi tbone and thanks for you answer. So what I do after a dive, is putting the whole regulator system into my bath tub and then I get the water hose and rinse it well. This includes aim inside the mouthpiece of the second stages of course without holding the exhaust button. Is that safe for my regulator ?
Simply rinsing externally as you do is certainly safe for the regulator. Many of us go beyond just rinsing and actually let the second stages SOAK in a tub of water for a few hours to dissolve any salt deposits.
If you soak your regulators, the caveat is to not soak the first stage unless you are confident that water cannot enter the first stage through its ports or tank valve connection. The dust cap may not be sufficiently watertight to guarantee it will keep water from entering through the tank valve connection. When I soak, I keep the first stage elevated above the tub and just let the second stages dangle in the tub to inhibit water from migrating up the hoses from the second stages into the first stage. Other people err on the side of caution and actually attach their first stage to a tank and turn the valve on to pressurize the first stage, virtually guaranteeing that no water can migrate up from the second stages into the first stage.
For wetsuits, I soak in fresh water but do not disinfect unless they become really stinky. Then, I use a dilute Dettol solution. I have seen no evidence of how effective this is in actually disinfecting, but many people believe it is effective, and it certainly removes the stink.