The X1 wire brush is a great tool for cleaning you nozzles and lead screws

We recommend having two of these brushes on hand.

You'll need one wire brush for cleaning your nozzles.

Warning: be careful not to touch any electronics such as heater cartridges or Thermistors as you might short out your main board.

You'll also need one wire brush for cleaning the lead screws.

DO NOT mix up these two brushes.  Lead screws don't like melted plastic and nozzles don't like grease, and oils.