With the AEG A4WMSTPN1 stain pen you safely remove stubborn stains from your clothing. If you spill red wine or soy sauce, you no longer have to throw away your favorite shirt. You use the stain pen in combination with a neutral, colorless detergent and some water. The pen creates microbubbles in the water solution with small vibrations, which release the stains from the textile. All types of stains get the right treatment. After the treatment, run an extra wash for a flawless result.