residue
Definitions
A small amount of something that remains after the main part has been taken or used.
A substance that remains after a chemical process, such as evaporation or combustion.
The remainder of an estate or property after all debts and specific bequests have been settled.
Examples
The chemical residue left on the glass beaker had to be scrubbed away thoroughly.
After the floodwaters receded, a thick layer of mud and silt residue covered the entire floor.