... hydrogen peroxide(dammit, sorry I cant remember the name of that stuff you put on cuts that foams up to dissinfect),
VapeOn,
Greg
... hydrogen peroxide
I had 2 hv 510 attys that were like this. So, i boiled them for a few minutes...then blew them out really well, stuck a pin in the little vent holes to clean them out..and they are working like new right now.
Might wanna try this.