I find these shields useful ( https://primesound.org/best-microphone-isolation-shield/ ). You need to get a good one that really doesn't have any reflective properties. I don't remember which one I bought, but I tried a few before finding one that really worked. I've used mine for vocals & for stereo micing a guitar. To be honest, I like it for vocals better as I like a little more room in the guitar tone...but in a less-than-ideal room, it could be a life-saver.