Left hand muting (ARGHHH)

I've been playing for a year, very sloppily, and I have started to pay real attention to my left hand muting. It sucks.
Are there any good exercises/stretches which would help?
I know what to do, but I have a feeling I'm doing it wrong.
Cheers.
Are there any good exercises/stretches which would help?
I know what to do, but I have a feeling I'm doing it wrong.
Cheers.
