To clean the jar:

Different people have their methods.
One thing you should never do is use any kind of soap or cleaner on the jar.
I find that putting some drug store hydrogen peroxide in the jar, putting on a 
waterproof canning jar top, and shaking vigorously pretty much cleans the jar, 
after which you should rinse with some distilled water. 
If your jar is turning yellow or you get yellow CS or plating out, you probably 
have impurities in the water from either the electrodes (don’t ever touch them 
with your hands, and if you do clean with hydrogen peroxide) or because your 
setting is too high and you are making the silver too strong.

Del

From: JERRY PRENDERGAST 
Sent: Thursday, April 04, 2013 3:47 PM
To: silver-list@eskimo.com 
Subject: CS>How to clean jars for silver making

Hi,
Would you please share how you clean your jars for silver making.
I was told by Silver Gen not to put the glass mason jars in the dishwasher. 
Only to rinse in how water.
I also thought they said to just keep reusing the jars ...no need to wash or 
rinse them after a use.
As I recently posted.  I have white on the bottom of the recent batch. So 
Sivler Gen said to rinse them in hot water. 
Do others rinse or wash out their jars which they use to make silver in?
Thanks, Sandy