It’s easy to get carried away and waste your creams, sunscreens and serums. Trudi Brewer shows you how much product to use and how to get the most out of them.

Cleanser – amount to use: 50 cent coin

TIP: Wet your hands with warm water rather than your face, and use a small circular movements to gently massage into skin.

TRY: Sanctum Purifying Foam Cleanser, $25. Murad Essnetial-C Cleanser, $74