What application to use to clean a macbook pro? I heard that some will give you viruses?

I am trying to clean my MacBook Pro since I only have 114.6 GB left in HD. I tried installing that robo icon that cleans your mac but was told it could give me viruses. I am super confused. Can someone help me just clean it without giving me the run around?? Thank you

"Only" 114 GB left? That is plenty.
Whatever you do, do not download or install any product claiming to magically "clean up" or "speed up" or "optimize" your Mac. Without exception, they will do the opposite. If you already did, you found the problem. Fix it.
If you installed MacKeeper, get rid of it now. It is junk that will cause only misery. Follow the instructions to delete it with care.
Do not install such junk on a Mac. OS X already includes all the utilities it needs for you to delete unnecessary files.
General Mac maintenance: Tips to keep your Mac in top form
That is all the maintenance a Mac requires. Really.
If you have been accustomed to using Windows, this will come as a shock to you. Get over it.

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