The Enthusiastic Weasleys

Having decided to use Number 12, Grimmauld Place as their base, the first thing they naturally needed to do was give it a thorough cleaning, inside and out.

The wizarding world had pests such as Doxies and Bundimuns, which were much like cockroaches, termites, fleas, and mold in the Muggle world.

Number 12, Grimmauld Place had been abandoned for over a decade. Even with household magic and a House-elf, cleaning it thoroughly would be no easy task.

When Fred and George left, they said they had a "secret weapon" that could make the cleaning twice as effective with half the effort.

Based on Wizet and Luna's reasonable guess, this so-called "secret weapon" was probably Mrs. Weasley—Fred and George's mother, Molly Weasley.

Neville was still the first to arrive. As soon as Wizet and Luna entered Grimmauld Place, they saw Neville wipe the bread crumbs from the corner of his mouth and wave at them.

Not long afterward, Hannah arrived as well, carrying a large bag filled with magical cleaning agents, which she had supposedly gotten from Old Tom.

According to Old Tom, these magical cleaning agents were highly effective. Supposedly, even grime that had accumulated for fifty years could be scrubbed clean with them.

Looking at the cleaning agents, Neville curiously asked, "Why would the Leaky Cauldron have...?"

Hannah's face immediately reddened as she stammered, "I asked my great-uncle too... He said it was because the Leaky Cauldron has been around for hundreds of years..."

"When Great-Uncle took over the Leaky Cauldron... he bought a lot of magical cleaning agents... But the Leaky Cauldron's history was just too long, so they never got used..."

Neville nodded in sudden understanding. "Hundreds of years... that's several fifty-year periods. No wonder!"

Hearing this, Wizet and Luna exchanged a smile. They had discovered a