As most of the public toilets I come across have a handle like a home toilet, what I do is to flush using my hand, but I put a couple of squares of toilet paper between the handle and my fingers before doing so. The commercial ones with a straight rod as a flush handle, well, I have been guilty of using my foot. That's the kind my elementary school had and it was common practice to do the foot flush on them.
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As most of the public toilets I come across have a handle like a home toilet, what I do is to flush using my hand, but I put a couple of squares of toilet paper between the handle and my fingers before doing so. The commercial ones with a straight rod as a flush handle, well, I have been guilty of using my foot. That's the kind my elementary school had and it was common practice to do the foot flush on them.