To descale a manual coffee machine: Prepare a descaling solution according to the manufacturer's instructions. Empty the water reservoir and fill it with the descaling solution. Run the descaling solution through the machine by brewing and discarding several cycles of hot water. Allow the descaling solution to sit in the machine for a period of time as recommended. Rinse the water reservoir thoroughly and fill it with clean water. Run several cycles of clean water through the machine to flush out any remaining descaling solution. Wipe down the exterior of the machine and any removable parts with a damp cloth. Your manual coffee machine is now descaled and ready to use.