You know, as a combination, acne-prone skinned gal, I've tried my fair share of AHAs & BHAs and some might even call me an acid addict (no, not THAT kind of acid), so I was completely taken by surprise at how much I like this Mario Badescu Glycolic Acid Toner ($18 for 8 oz/ larger sizes available); it has actually made a big difference in my skin within the two months I've been using it!
*EDIT*: After using this toner for about 7 months and nearly finishing the bottle, I believe my skin is now too sensitive to be using it on the regular basis. My skin might have changed from when I first started using the product, but now it seems to burn a bit too much, and causes quite a lot of redness. I also once accidentally overused it and came out in an eczema-like rash on my cheekbones and on top of the lips. So please proceed with extreme caution and if your skin is sensitive, maybe opt for a different exfoliant.
If there's one thing I could change about this toner, I could probably do without the grapefruit extract; I suspect I may be allergic to citrus essential oils in general, so next I may try the Paula's Choice liquid AHA exfoliants. Do you use an exfoliating toner in your routine? Or are there other exfoliators that you prefer?