I acquired a nice Lie-Nielsen scraper plane in a tool swap. I’m the 3rd or 4th owner. It was in great shape except for a little surface rust. While I was in the shop doing a little cleanup from the last several projects, I decided to spend a half hour cleaning it up and getting it ready for use.
The photos below explain the basic process I went through. First, I went about removing the rust with 100-grit sandpaper. I took some care to keep the scratch pattern straight and consistent with the original pattern from the factory’s grinding machines. Then I moved up to 120-grit, finishing up with 400-grit and then a final polish with a green non-woven abrasive cloth, again keeping the scratch pattern consistent. While I was at it, I used the 400-grit paper to polish up the smooth portions of the blade holder.
To clean the accumulation of dust and grime from the inside, painted bed, I removed the tote and knob then used an old toothbrush to get rid of most of the dirt. Where I couldn’t reach with the brush, I used a long cotton swab — you know, the kind you see in jars in doctor’s offices. You can buy a pack of 100 from Grainger (formerly Lab Safety Supply) for about $5 or 1,000 for about $25. I use them a lot. After most of the dirt was brushed away, I wiped out the bed with a rag dampened with WD-40 then re-installed the tote and knob.
For the rougher portions of the brass castings on the blade holder, I scrubbed them with a brass-bristle brush. This removed the grime from the shallow recesses of the castings.
Before installing the blade, I applied a coat of clear paste wax to the bare steel and brass to hopefully stall any more rusting.