I use this to buff the varnish and remove the greasy, acid marks my hands and fingers leave on the body and neck. I would recommend removing the strings since the cloth I received does leave lint on the strings and any sharp corners around the bridge and saddles.
It's a pity I have to use another cloth for my strings and delicate areas but it is what it is, a very good cloth for sweat and dust removal and for putting the lustre back into the finish. However, I can't give it five stars when I find myself picking lint off my guitar. I find old, cotton underwear is more effective for the strings!