Squeeze the safety cap at the marked points and turn counterclockwise at the same time. Distribute durgol WC all around under the rim of the bowl, leave to act for at least 5 minutes, brush again in case of heavier soiling, then rinse.
Important notes: Not suitable for toilet seats, lids or other acid-sensitive surfaces (e.g. marble). Remove splashes outside the toilet immediately with plenty of water. Do not use together with other cleaners.