It’s always a good practice to clean and to optimise your CSS. There are a lot of websites that offer these services, I searched and I found the best 2:

• ProCSSor – Advanced CSS Prettifier: graphically very good, lets you choose between a lot of brace styles. Simple to use and very well done.
• code beautifier: this service lets you format your code but also optimise it. It compress color, font-weight and it discards invalid properties.

For the best results I advice you to use code beautifier and than ProCSSor – Advanced CSS Prettifier.