Yes, baking soda is a great exfoliant, but not for skins that are super-sensitive.
I often do homemade masks - yogurt, all sorts of things :D. A few days ago, I did one with softened butter and egg yolk, Skin was super-soft after that.
Liz, I use Rx-strength Retin-A every few nights - not Paula's Choice, Rx from the pharmacy. If you want to know more specifics on why/benefits, I can share here.
When it comes to Paula's Choice, on other nights, I use her BHA Gel (1 or 2%).
I love Paula's Choice moisturizers for day time.