Depends where they are.If they are nose or the bit between mouth and chin, i wait till i have had either a warm shower or wash my face in warm water, both open the pores. Then i use the special nose strips you can buy. I do that maybe twice a month unless i notice it get bad, then do it again!. I find they work really well at pulling blackheads and blocked pores out. Afterwards, just give the area a wipe over with a gentle toner to close the pores again. Nothing too harsh, or it causes the skin to over produce oil, and you get even more blackheads!