This what I do with my beloved Pocono for the past three years with no visual rust at end of the summer in firebox or pipes. I did the LPS things on the pipes when I first had a hand fed. It smelled during the summer heat and was pretty drippy.
As always, excuse my long winded rant though some of the detail is needed when a spray coating like LPS is not used.
* Remove pipes from stove to chimney in easiest way possible. Brush inside of pipes and baro with steel wool and vac clean best effort. These pipes including baro will be stored in pieces in sealed firebox. More on that later. If possible leave a pipe on the stove exhaust since you will be putting a piece of plastic over the pipe hole later to seal the firebox at this location.
* Remove all coal from stove.
* Scrape inside all over with Dollar Store putty scrapers. Inside of doors also. Vac the mess up. I use a mask when doing this.
* Clean under grate, etc.
* Put a piece of aluminized tape or whatever over combustion fan inlet. Or can also stuff a couple plastic grocery bags in the hole under the grate. Goal is to seal this area from incoming humid air.
* Seal the prior noted exhaust pipe with grocery bags or whatever. I wrap electrical tape around the pipe o.d.
* Stuff a big wad of grocery bags in the hopper hole. All humid air entrances to the firebox are now sealed.
* Put pipes and baro in stove firebox. Another reason to buy the Pocono (taller inside
for longer pipe storage). This may be more difficult to do with Pioneer or Lil Heater.
* Get a DampRid dispenser and a bag of moisture absorber from HD. Cheap. Put in firebox.
* Ensure your door gaskets are in good condition on two doors and close handles securely. Firebox is now sealed best effort.
* Replace the Damp Rid stuff every 4-5-6 weeks. Replace absorber powder when you see water in bottom of dispenser cup and absorber stuff gets crystalized.
* Enjoy a couple cases beer from the money you save not buying 2-3 cans of LPS.
One summer I found a digital humidity meter at a tag sale, it read 28 % humidity for quite a while until the Damp Rid started to get old. Understand that preventing rust on steel requires a humidity 40% or less (without ash).
..And remember at start of the next season to remove all the bags like I didn't....