How to remove dc offset(dc component) and unwanted frequency components from an input signal?

Hi everyone.

I measure continuous sinusoidal current from 'three phase VI measurement block' (one of the SimPowerSystems' block). The measured signal contains dc offset and harmonics along with fundamental frequency component(fundamental frequency is 50Hz (desired frequency signal)). How can I remove dc component and unwanted frequency components from the measured signal to get the pure 50Hz frequency signal?

Thanks in advance.