For what it's worth I typically flush everything with the hose containing an inline filter and then fill it with 60/40 mixture of distilled water/coolant and then top her off with a bottle of water wetter.

I got lazy this summer and didn't flush mine like I said I was going to... pretty sad as I've already got the distilled water, a bottle of water wetter, and two bottles of Motorcraft Gold all ready to go. Maybe I should actually do this sometime soon now that you've reminded me.