Ironing synthetic at high temperature causes stain when synthetic material is scorched. Synthetics or synthetic-mixed fabrics can only be ironed at ‘oo’ or ‘wool’ temperature setting or lower

Step 1. Always set the temperature acording to the type of clothing being ironed. If unsure, always start with a lower temperature.
Step 2. If the soleplate is stained, heat up the iron to ‘max’ temperature and iron the soleplate over a piece of moist cotton rag

Illustration of temperature dial with different settings for different garment materials