I purchased the Endust for Electronics at Staples about 3 years ago and I still have more than a half can left. You only need a very small amount to do the job. You may also be able to purchase it from some online sources--do a Google search for it.
Gary
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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)