Does the acne on your chin get worse during a certain time of your cycle? Acne on chin is usually caused by hormones.
The best thing I found so far is to exfoliate with Scotch tape! Just stick on, and gently peel off. Do this about twice a week, and make sure to use sunscreen.
Baking soda paste also works well on stubborn acne. I dab it on before I go to bed, and it's significantly smaller the next day.
You might also want to consider taking herbal supplements. I take Vitex (chasteberry). It's supposed to regulate your hormones. It helps w/ my PMS for sure!
Are you dieting and losing weight? If so, the toxins that get released from your fat cells could be contributing to the acne. Drink tons of water.
I would definitely switch your cleanser. I use Burt's Bee's garden carrot soap to remove makeup. The soap will last a looong time. Then I tone with Nivea Viage moisturizing toner (haven't found a cheaper natural alternative). I just started using this and love it! And I moisturize with olive squalene and vitamin E. My pores clog very easily, espcially w/ oils, but none of these do.