Glass cleaners make it easier to see through windows, but you might strain your eyes to read their warnings about potential dangers to children and pets.

Manufacturers of glass cleaners aren't required to put such information on the outside of their containers. Some place the warnings there voluntarily, but others place the warnings on the back of the front label, requiring you to peer through liquid—some have that distinctive blue color, though that's not the only hue—and you might also have to read around the bar-code sticker.

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