I used to faced this and here is my recipe, hope it works for you as well:
Use lemon juice directly to apply to the skin, for about 15 minutes and rinse with clean water.
Or you can make a mask with lemon juice, almond oil and glycerin. All raw materials are mixed well and you can rub on the surface of blackheads or the whole faces. Wait 15-20 minutes then rinse off with cool water. This will help not only you remove the blackheads quickly, but also lighten dark skin areas. By this way, you just need make 1 times/week.
Note: For the sensitive skin, you should limit the application of this method since lemon has a bleached property.