Living in London means getting on public transport a lot and although I don't mind it, my skin does. I try to deep cleanse at least twice a week and one way I like to do this is with a clay mask. I find clay masks the best for really getting deep into the skin and cleaning out any congested pores.
The 5 Minute Thermal Detox Mask from Sanctuary is a "warming charcoal treatment" that literally warms up on your skin. The sensation is quite strange as it warms and then cools but it really works great for congested areas. After cleansing I usually massage a small amount onto my forehead, nose and chin, wait for 5 minutes and then remove it with a muslin cloth.
It helps to brighten the skin and draw out any impurities from the skin. I've been using it twice weekly and my skin is feeling great!