1. Unplug the appliance and let it cool down completely — at least two hours. 2. Remove the iron and the water tank from the steam generator iron. 3. Remove the EASY DE-CALC knob anticlockwise to open it and pour out the water with scale particles from the EASY DE-CALC opening. (A) For PerfectCare Elite (GC96xx), PerfectCare Elite Plus (GC96xx), PerfectCare 9000 series (PSG90xx), PerfectCare 8000 series (PSG80xx, PSG81xx), place the steam generator iron at the edge of a table or sink, (B) Hold a cup (at least 900 ml) under the EASY DE-CALC knob. 4. Hold the appliance in the position where the EASY DE-CALC opening is facing up and pour 500 ml distilled water into the opening. Note: for PerfectCare Elite (GC96xx) and PerfectCare Elite Plus (GC96xx), PerfectCare 9000 series (PSG90xx) and PerfectCare 8000 series (PSG80xx, PSG81xx), PerfectCare 7000 series (PSG70xx, PSG71xx, PSG72xx, PSG73xx), pour 900 ml distilled water. Caution: Be mindful of the appliance's weight when tilting it. Tip: To avoid water overflow, aim carefully and pour the distilled water directly into the opening. 5. Keep the EASY DE-CALC opening facing up, reinsert the EASY DE-CALC knob and turn it clockwise to secure it. 6. Fill the water tank halfway and place it back in the steam generator iron. 7. Plug in the steam generator iron and switch it on. Allow it to heat up for five minutes. 8. Keep the steam trigger pressed continuously while you move the iron on a piece of thick cloth for three minutes. 9. Stop moving the iron when no more water comes out or when steam starts coming out. 10. Remove the plug from the wall socket. 11. Let it cool down for at least two hours. Do not open the EASY DE-CALC knob during this period. 12. Pour out the water with scale particles from the EASY DE-CALC opening. 13. When no more water comes out of the appliance, keep the EASY DE-CALC opening facing up, reinsert the EASY DE-CALC knob and turn it clockwise to secure it.