Have you ever tried Dr. Brandt's Vacuum Cleaner gel? I hear good things about that with continued use. 

I think scrubing is also good option to remove black heads.

I just posted a similar question, so you are certainly not the only one with this issue. Solidarity! I use a toner and I think that has helped. If you can afford it, monthly facials are also good. I have tried face masks but they haven't really helped, neither have pore strips.

The pore strips have helped tons for me. The Biore pore strips if used twice a week can help clean up your nose in a month. I also use exfoliating face wash, I mean I still have some black heads, but they are not as bad as they used to be. I hope it helps, good luck!

I know it's expensive, but I believe my clarisonic and weekly masque (not expensive) work best for me. Once they get started, they are pesky to get rid of.

I actually had some of these pore strips cause broken capillaries, so I have been wary of them ever since.

There is a face mask called Boscia luminizing black mask. When you peel it off you can see the black heads and dirt come off with the mask. It is kinds expensive but if you go into Sephora they will make you a decent size sample to see if you like it. I like the Brandy's vacuum cleaner also. If you are looking into natural remedy I wonder if tea tree oil would work.