I've just finished cleaning my brand new Harrelson (arrived on Monday) - it didn't sound or look like it needed it but I was surprised how much "manufacturing swarf, and fines, and stuff" cleaned out. Not a huge amount I admit, but enough to see. This will always be the case with new equipment even high quality hand built instruments simply because, for the manufacturer, time is of the essence, and because I'm particularly careful with any new acquisition. You get to "know" your instrument if you bathe it (much like a new baby) and the process allows you to keep a very close eye on it's inevitable deterioration over time and to deal with necessary maintenance in a timely manner. In my workplace we wash B747s once a week - just like my car - they are hand washed and some maintenance tasks are carried out as a direct result of the process.