A picture from the aftermath after a very, very rainy yule-faire last weekend:
And people, don't forget to oil or wax your leather as well. We used a cheap but good leather oil to oil up any and all leathers, including chinstraps, latch-wraps and aventail leather as well as belts, handles and scabbards.
For the steel we started with the equivalent of WD-40 (I imagine at least, 5-56 is the Swedish miracle oil of everyday use) for gently rubbing off any surface rust and early oxidation from finger prints and rain. After we were happy with the results, we wiped them clean with thick paper towels and some rags and we put on proper, non-acidic weapons wax on the armour that was to be handled by the public the next day and buffed it back up to a slight shine. The swords were given a nice slathering of fresh oil and put in their scabbards to re-apply the fat from the inside and out and to create a nice, cosy environment for storage.
Unfortunately, I was not wise enough to take an "after" shot. And yes, I know of the massive ammount of completely inaccurate stuff, but even the scrap should be cared for.