The iron-cleaning reference places unplugging and full cooling before work on the soleplate. Cleaning a hot connected appliance risks burns and can bake a product onto the base. The surface should be checked against the manufacturer's instructions before a household solution is applied.

Cool and Unplug an Iron before Soleplate Cleaning

The article discusses diluted vinegar, but not every coating or internal system permits it. Use an approved method and keep liquid out of unsuitable areas. External soleplate care and reservoir descaling are separate tasks with different requirements.