Something weird is going on in Washington D.C. and I’m not talking politics. It’s the big, white, marble dome on the Jefferson Memorial. The caretakers of that beautiful structure are flummoxed by what to do about the grungy, gooey mold-like gunk that has begun collecting on the dome, turning it from white to a dingy, dirty mess!

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So far, experts have managed to give the yuck a name—biofilm—and determined that it’s a combo of algae, bacteria and fungi.

Here’s the problem: How to treat this icky stuff without damaging the soft marble of the Jefferson Memorial so that it remains safe for the environment and visitors alike.

When I read about this situation, of course I knew what to do. Of course! But I won’t be calling anytime soon to share my directive, which would include a helicopter with a huge sprayer and a thousand gallons of one of the most amazing products I’ve come across in a very long time. However, I am excited to share that with Ruby, who wrote:

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