You can find it at almost any place that sells electronics. If you have a desktop, unplug the keyboard from the computer. Don't tilt the can, as it can pour out liquid. If dirt or food is blown out, brush it away from the keyboard. See if the keys are unstuck.

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Write a summary of the previous text in Indonesian:
Beli satu kaleng berisikan udara terkompresi. Matikan komputer. Gunakan semprotan udara di atas dan di sekeliling tombol-tombolnya. Sikat partikel-partikel sisa. Cobalah tombolnya lagi.