I use a compressor to blow air it high pressure into all of the small and large spaces after rinsing in hot water and I get absolutly no rust on mine. If you dont have a compressor. You can use a hair dryer. I found that in the oven I would get a little bit of surface rust but when blowing with even cold air I get none. The heat in the oven speeds up the rusting process but it drys before much can take place (unless you have a convection oven). The trick it to remove the moisture before it can act on the metal. I think a hair dryer will work OK too but you will need to make sure that you blow it into the action and chambers. One of the best things about the compressed air is that it fores the water out of even the threads and nipples if you apply it closely to them.
God is fluxing me which is good but it is not fun.