I have a plethora of Mac Maintenance articles on this blog. It is a very important part of owning a Mac for sure. I review maintenance Apps from time to time. One of the Apps that I use is called Cocktail by Maintain Software. Cocktail is a very versatile Mac maintenance App, if you are looking for just one App for this purpose I highly recommend it. This article and this article describe how to use it and what it can do.