YOOPAI 3D Printer Nozzle Cleaning Kit, 3D Printer Cleaning Kit with Soft Rubber Handle, 0.4mm Nozzle Cleaning Needles and Copper Wire Brush, 3D Printer Tools Kit for 1.75mm Nozzles

For the top, leave it, that's normal for a1 nozzles. For the bottom, heat it up with a butane torch lighter and GENTLY brush it with a copper wire brush. I use this kit for all my cleaning and declogging I'd also recommend getting some helping hands that are used for soldering, a silicone mat, and some heat resistant gloves. Probably overkill but molten plastic is no joke.