En el link inferior tienes un acceso a una web para rápidamente limpiar tu CSS. Copia y pega o introduce la URL.

CSS Cascading Style Sheet Optimiser

Style Sheet Optimiser

This tool is used to optimise CSS code. Enter either a URL or Copy & Paste the stylesheet into the box, and click Go. More information on this tool can be found on the about page.

Online CSS Optimiser/Optimizer : flumpCakes