Residue. What does it mean according to Oxford On-line Dictionary: 

NOUNa small amount of something that remains after the main part has gone or been taken or used.
​​You know the time you walked away from something, finished because you washed your hands of it? It's over. Only to find yourself still pondering the situation? And it invaded your thoughts and engaged you once again because it popped up out of nowhere? Check out this video, 'Residue' at our Unapologetically TruU Channel. Don't forget to subscribe!