So, basically you want to suck (or blow) lightly on the outside (non pad) part of the grados? I'm also guessing that you should try not to cover the entire grill to avoid any kind of vacuum and damage?
This all seems a bit unclear to me, but I'll give it a try. I have a feeling it might be a good idea to just open these up and see if there is any hair or a "crinkle" although I'm not sure I would recognize it if it was there.
Edit: I decided to just go ahead and try the blowing/sucking VERY lightly on my ms1's. I did both because I wasn't sure which would work better, and I did it so extremely lightly that I was pretty sure there was no way it would actually help, but I was worried about causing any damage. So far...it seems to have worked, which seems beyond unlikely to me. Maybe it's just confirmation bias and I can't hear it right now, we'll see.
Oh I should mention that I also played music pretty loudly (actually at the complete max volume from my unamped source) out of them for a while, as I saw that advice a few places too. Not a very scientific way to go about things, I know, because now I have no idea what worked.