This might refer to the dirty ring left around a bathtub when someone soaks in a bathtub with soapy bubbles then empties the water. The dirty soap clings to the the sides of the bathtub leaving a ring mark of residue where the high water level was.
What is refinery residue
Salt (NaCl) is not a residue.
A residue is something left over. Fires usually leave a residue of ash.
The oily residue was sent to the lab for examination.Go and wash that residue off your hands.
That is the correct spelling of the word "residue" (remaining, as of a spilled material).
This residue is bitumen.
Residue of The Residents was created in 1971.
There was a powdery residue left over after I evaporated the solution.
Does crack cocain leave a residue
It's cyanoacrylate residue.
Residue Hymns was created in 2007-10.
The residue from the experiment after the evaporation was salt.It took a long time to clean up the residue of flour from the kitchen floor.