Think I read quite recently that it’s not referring to the tears that you cry, but the tears in your hair - as in, split ends.
It’s one of those classic misunderstanding things that the company never thought to correct as it sold more shampoo - just like the idea that buying new shoes suddenly gives you the ability to walk up walls.
haha. i used to live about 500 yards from that road sign. amazingly i’ve just looked on google maps and they’ve managed to capture it with the L intact.