In any event, opened up electrical box in DW, & found evidence
of massive overheating; melted insulation, wire nuts look burned.
Also saw very junky workmanship, no Romex connector, electrical wire just pulled thru nice sharp edged hole.
Maybe they had a few extra miles of old stock aluminum wiring handy and used it in this building, or ????

I want to put this back together safely. I read that some *purple* wire nuts are made for aluminum/copper connections.
I also seem to remember that there was some sort of paste you could use on the connections that kept things from overheating.

Perhaps I could put a nice new metal box on wall,
connect aluminum wire to aluminum friendly receptacle,
then install a wire with standard plug between DW and receptacle?

Help !

To answer your specific question you need to use receptacles labeled CO/ALR or pigtail with copper using a approved connecter (e.g., Ideal's #65 wire nut) and then you can use a "regular" receptacle. Make sure none of the aluminum wire's insulation had been damaged by heat and add the appropriate cable clamp to the box.