I took my laptop in for a cleaning about a month. We've been doing some construction work inside the house, and dust is flying everywhere. I told the technician this. What he did was grab a hose connected to an air compressor and used it to blow the dust out.
Like you, I had been using the canned air to try and get the dust out. With all the dust that came flying out of my computer when the technician took the compressor to it, I've realized that the canned air doesn't have the power necessary to get into all the nooks and crannies that exist in a laptop.
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