Nerida stood in front of the suits of armour with the nozzle of her vacuum in hand, lots of dust on these things.

With a tap she said, "Vacavus!"

And the vacuum sprung to live, nozzle fighting trying to jump out of Nerida's hand. The blonde Ravenclaw slowly and carefully began to vacuum the suits of armour and behind them, even the cracks between them. Standing on her tiptoes Nerida tried to get the dust on the top of them, the couple inches that she grew over the summer really helped with trying to use the vacuum to suck up the dust.

Anything with dust was going to be vacuumed!