Lincoln Memorial Reflecting Pool drained and scrubbed in annual spring cleaning

It was spring-cleaning time at the Lincoln Memorial Reflecting Pool Monday!

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The National Park Service posted video online of a drained pool being cleaned by what they call a 'Super-Scrubber.'

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The 'Super-Scrubber' is a modified CAT track machine with a powerful rotating scrubber on the front end that cleans the concrete bottom of the pool.

"It's quite a sight... and quite a smell," the tweet read. The annual scrub removes algae, goose and duck droppings, and other trash that buildup in the pool throughout the year.