I’ve heard of "soap on a rope", but actually, I think sunblock-on-a-rope is a much better idea. Why on earth would you need your soap to be on a rope, anyway? Where would you be taking it that such a thing would even be necessary? The mind boggles.
Sunblock, though – sunblock is a completely different matter. If you’re planning on leaving your house at all during the summer months (and, actually, during the rest of the year too, if you care about your skin), you’re going to want to have your sunblock with you. What better way to make sure it’s always handy than by sticking it on the end of a rope? Genius.