Do you ever experience open string noise when playing power chords?
One of the most important things about playing power chords is muting the strings you AREN’T playing.
This is best done with your 1st finger.
If you’re playing a root 6 power chord, you’ll be using your 1st finger to play the root note on the low E string and your 3rd or 4th finger to play the 5 on the A string.
As well as using the 1st finger to play the root note on the low E string, let it rest on the A, D, G, B and high e strings to mute them.
If you’re playing a root 5 power chord, you’ll be using your 1st finger to play the root note on the A string and your 3rd or 4th finger to play the 5 on the D string.
As well as using the 1st finger to play the root note on the A string, let the tip of the 1st finger nudge into the bottom of the low E string to mute it.
Also, let it rest on the D, G, B and high e strings to mute them, too.
Applying this muting technique to your power chords should clean up any open string noise.