Flip the keyboard upside down and rap gently on the case. This will
loosen and dislodge any larger, heavier foreign matter, and allow it to fallout of the keyboard. A soft-bristled brush will help loosen the debris. Return the keyboard to an upright position. Use a can of compressed air (available from almost any electronics or photography store) to blowout the remainder of foreign matter. Because this tends to blow dust and debris in all directions, you might wish to use the compressed air outside or in an area away from your workbench. A medium- or firm-bristled brush will help loosen any stubborn debris. Now that
the keyboard is cleaned out, squirt a small amount of good-quality electronicsgrade contact cleaner (also available from almost any electronics store) into each key contact, and work the key to distribute the cleaner evenly. Allow a few minutes for the contact cleaner to dry completely and test the keyboard again before reinstalling the key caps. If the problems persist, the keyboard might be damaged or the individual keys) might simply be worn out beyond recovery.
In such an event, replace the keyboard outright.
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