Cleaning up shop at the end of a task or the end of the day is a way of extending courtesy to yourself tomorrow. Having things where you expect them to be when you start the next job is the best reason for cleaning up after this job; it makes work much easier and reduces frustration. Few things are as satisfying as putting in the last bolt or putting the seat back on the bike and seeing it whole again (then going for the mandatory shake-down ride), but that is not the end of the day’s work. The half hour or so that it takes to wipe things down, put tools away, take care of the rags, &c., is last act, and it can be a very pleasant, low-mental-energy, reflective way to wind down. It is also a great time for a beer.