What is "drainings"

Usage examples of "drainings".

There were gummy stains on it, too, like crankcase drainings or old strawberry jam.

I watched the doctor rummaging in the glimmer of his bag, bottles clinking, his steel glasses and bald head shining with the glow of his useless potions, his meaningless spells, before he applied the drainings and poultices that always left my mother filler and more fretful.