Lon,
The solder dust on the Maple will cause it to "grey" up I found. I tried to vacuum the dust off immediately during sanding. I also found the black Wet/Dry sand paper seemed to contribute to the problem, particularly in the finer grits. So I steered away from using that paper. Next I tried keeping the area of the sand paper confined to just the soldered part. - Meaning I did not draw the sand paper across the entire call, which would spread the fine solder particles. I finally wiped it down with mineral spirits and a followed up with a dry paper towel. Once the black stopped wiping off, I called it ready for finish. I used "Tru Oil" on these and it seemed to work real well.
HuntnCarve
Dave