I recently tried out CleanMyMac and love it. It cleared caches, logs, unnecessary lang. files and a bunch of other useless junk that had accumulated over time and all in one initial search. The main advantage of using CleanMyMac is the simplicity on offer. No advanced knowledge is needed to determine which files can be deleted – everything is handled automatically. If you’re suffering from a sluggish macbook or a lack of hard drive space, CleanMyMac is definitely worth looking into. Other alternatives include:

• Xslimmer 
• Cocktail