Luckily, it all came apart easily and cleaned up easily as well. I used my air compressor to blast the debris out of the core, and ran water through it as well to get anything the air wouldn't get. By the time I was done with it, you could see through it! Next up was to make sure there were no leak or clogs in the core. I figured it used to produce good heat (somehow even with all the crap in there), so there weren't any clogs. I did a mix of muraitic acid and water and poured it in to sit for a bit. All that came out was a bit of dirt, nothing big. I did a final flush and all is good. Next up was stripping the box and painting it. It had a bit of surface rust but it sanded right off. After priming and paint, it looked brand new. The final process was installing the foam rebuild parts. That was easy as well, but made the fit a bit snug when putting it all back together. But, it all looks brand new, and should definitely heat more efficiently.
