I've got blocked pores on my cheeks - like little whiteheads without heads but if I have a squeeze I can get stuff out. They're not visible in all lights but the horrific overhead lighting in my brother's bathroom yesterday really showed them so I stayed in there for 10 minutes having a go at them! Which exfoliant will best get rid of them? Lactic? Salicylic? Is there a reasonably priced one anyone can recommend? Thanks