This is a wire brush holder for an anet a8, though it may work with other printers. Using a custom start script in your slicer software will let you clean the ooze from your nozzle before each print starts. The brush can be purchased at most box stores and hardware stores. This one came from the Dollar Tree. The brushes usually come in a three pack that includes a steel bristle brush. I would not recommend using that one. Use the brass bristle brush instead.
G-CODE is included in the provided .txt and .gcode files for download.
The wire brush was purchased in a 3 pack from the Dollar Tree, but brushes from Harbor Freight or any other place, that look like this brush should work just as well. Just cut the handle off as shown in the picture then slide it into the holder.