the olive blog doesn't recommend this but Wired's blog's Danny Dumas has an interesting result following smearing the screen with olive oil:
"Water & Oil - Granted, the iPhone's touchscreen isn't really designed for this kind of abuse, but the inspiration for this line of testing stems from some real life scenarios—primarily using the iPhone while in the rain, and while eating. For the water test, I immersed my thumbs in tap water (both hot and cold) and then proceeded to use the device. The results weren't too surprising—water and electronics almost never get along, and the touchscreen was no exception. The accuracy and response of the key presses was 50/50 at best, and when the entire surface was covered with water it became unresponsive. After a quick flick of the included microfiber cloth, it was fine. The oil test was a little different. For this, I dipped both of my thumbs in delicious extra virgin olive oil and then used the device. Strangely enough, the iPhone was much more responsive to tap and drag motions, and it even seemed to do fine when the entire screen was covered. Next up: iPhone sautéed with lemon grass and truffles."

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