Why do you think it needs "cleaning up"
I have owned my two Macs for 2 & 3 years. At my office we have 75+ Macs - none have ever had a problem that necessitated them being cleaned up. They have had a harder life than you will ever give your domestic machine.
I am totally convinced that many many people in the Windows world mess their machines up with too many malware and clean up applications. One of the joys of using a Mac is that such issues very rarely enter a users head.