comments:
activoice posted on r/askto1w
They sell it on Amazon and at Staples https://a.co/d/07kftDe9 https://www.staples.ca/products/343053-en-staples-electronics-duster-compressed-air-7oz You can check with your partner to see what he usually does, but unless he is taking the bottom off the laptop, he is probably just cleaning it with one of these.