Printhead Cleaning Cards safely and effectively remove contamination from the printhead, platen and label path of your Dymo LabelWriter. Use these cards once or twice a month or whenever print quality diminishes. Cleaning cards improve print quality and extend the life of your LabelWriter.Printhead Cleaning Cards safely and effectively remove contamination from the printhead, platen and label path of your Dymo LabelWriter. Use these cards once or twice a month or whenever print quality diminishes. Cleaning cards improve print quality and extend the life of your LabelWriter.