Since the 510 atomizer is made of steel it won't rust instantly(Over a few washes) like iron will. But stainless steel does rust, it just takes a lot longer. So to get the longest life out of them I recommend PGA. If you don't have any its no big deal. Like I said its going to take a long time to oxidize and rust, but I just like to do everything I can to save a few
. After all, thats why we're doing DIY right? 
Vinegar works good too.

Vinegar works good too.