Regulator dunked in water with shampoo

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I am not able how to pressurize it so that option is hard if not impossible. Would rinsing/soaking with fresh water be enough?

Yes, I'd swoosh it around in the water for a little bit too (without pressing the purge).
 
I`d posted here twice and repeat it some times, how to clean your regulator in the fresh water and do not be affraid of leakage: (see marked bold)
Two tricks for cleaning your reg:
1. When you start to clean you second stage in fresh water (just when you return from water to DC (Diving Centre) or to the boat, if it had pool with fresh water) - you have to stay connected it to the tank.
Then start to shake it strongly horizontally, when exaust valve(s) on the top, and mouthpiece at the bottom.
This will keep two dividends:
When you shaking - membrane will be pressed from water pressure or water depression (does not matter why, just bubbles should to go).
When bubbles goes from mouthpiece to exaust vale, it takes some water (like airlift) and cleaning inner space with more forces, and better.
When you have pressure in hose - it was impossible to pass water in hose. And also it will clean seat and valve more better.


2. When you try to disconnect 1st stage from tank - after closing valve do not drop the pressure less than 20bar. Then try to disconnect DIN or Yoke carefully from valve. It will make "psssst", and stops. Do not press purge button on 2nd stage after! You should stay pressure in the hoses.
When you make this step - you can loose HP o-ring, be carefully. Put it back to the sink.
Than close hole in the 1st stage by finger, and then put regulator to the fresh water and shake it storngly.
THAN shake it from water drops, remove finger, AND SLOWLY press purge button.
When pressure in the hoses will drop less than IP (setup pressure or Intemediate Pressure), you 1st stage will opening, and air starts to go from hoses, over regulator, over the filter to the out.
It allow you to get some dividents:
Your filter will be cleaned from any possible drops of water.
You filter will be cleaned from any rust particles from the tank.
And you be able to see, how it clean, when you will put you palm before air stream. All particles will stay on your wet palm (I hope you are freshed regulator before :) )
And also that allow to prevent water ingress inside regulator when you will freshening it.

I`m always try to disconnect my regulators from tank valves under pressure! :)
Sure, tank valve should be closed at this moment.

How and why I do it:
After closing tank valve I make pressure drop (checking by SPG) till 30-40 bar, by pressing purge button on the second stage.
Then (I using DIN only) slowly turning DIN nut (NOT regulator body!), until it starts to "psssssst", waiting, and than easy disconnecting regulator from tank valve.
With Yoke it much easy to do.

Than I check O-ring, and when it came out from groove, putting it back.

At this moment we have:
Closed tank.
Detached regulator.
AND! Pressure inside regulator and hoses, equal to IP.

Then I SLOWLY pressing purge button.
In one moment regulator valve will be opened, and air starts to going out from HP connector through regulator filter.

This allow to clean filter by air, containing inside hoses.
This allow to clean filter from rust particles from the tank and from any water drops, that could stay inside connector.

I`m doing it ALWAYS :)

Only one bad thing could be there - you can lost or dammage your O-ring on the HP connector. You just need to be care about it.
No any other problems could be here.

P.S. you can put your wet hand before HP hole when you doing it, and you will see, how many rust you have on the filter.
Try to do it, and you will be amazed.
this way can help you to prevent ingress of small amount of water in ocassional drop of your regulator in to the water.
 
I`d posted here twice and repeat it some times, how to clean your regulator in the fresh water and do not be affraid of leakage: (see marked bold)



this way can help you to prevent ingress of small amount of water in ocassional drop of your regulator in to the water.

I regularly rinse my regulator with fresh water after each dive, while still under pressure (the regulator, not me :D ). It was just not a possibility in the dive center I was yesterday, leading to my dumb mistake.
 
I usually rinse my regulators (and all my other dive gear) with wet suit shampoo

Fill up a bathtub or 55 gallon drum with water, add a splash of shampoo, toss all my gear in and give it a rinse. Pull it out and let it dry

Hasn't seemed to cause any issues with the regs
 
I usually rinse my regulators (and all my other dive gear) with wet suit shampoo

Fill up a bathtub or 55 gallon drum with water, add a splash of shampoo, toss all my gear in and give it a rinse. Pull it out and let it dry

Hasn't seemed to cause any issues with the regs
You throw your first stage in that tub aswell?
 
https://www.shearwater.com/products/peregrine/

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