Those were early days of my sales career. I was an enthusiastic Metalworking Fluids Salesman who had a plan to make at least five sales calls on the very first day of week, Monday. Early morning with the prior appointment I reached my first destination which was an auto component manufacturing company.  I was about the enter the machine shop and I saw most of the machine operators were standing outside. It was a surprise for an inexperienced guy like me to understand why these men are standing out when the machines are running? With Curiosity, I gathered some courage and asked one of them, is everything alright? Why are you people standing out while machines are on. The answer I got was “It's Monday Morning Smell Buddy.”  While the machines are not working during weekly off, when we turn them on after a day, the metalworking fluid stinks. This experience of mine is a decade old, but even today whenever I get a chance to interact with MWF users I still hear many similar complaints.  This nice article from S.S. Chemical Company will help you understand causes and solutions to MWF Monday morning smell.