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Ampeg svt stained screen cooling fan

Hi there, I have an Ampeg SVT classic. The sound is sweet and I'm really in love with everything about my gear but the screen is getting stained, I believe because of the cooling fan. Is a circular spot of discoloration. Please, if somebody know how to resolve this before it really gets trough the screen I'll REALLY apreciate it. I don't know if it's because of some wrong setting, I'm just lost.

Thanks
 
it's from the dust in the air going through there. you could probably use a vacuum or brush or a damp cloth to get it off somewhat. i once had a producer when my band was making a cd ask me if that was a speaker. lol
 
Try cleaning it with a cloth soaked in mild detergent (couple drops of ivory hand soap or dish detergent), then rinse. Don't stretch out the grille cloth by pushing too hard. It is better if you remove the frame and clean both sides but try this first.