I use oven cleaner or ajax, or whatever I find in the cupboard at the time.

I do have a dimple on my upper lip (like beauty mark spot) that I got from scrubbing the bathroom with domestos.. I flicked some in my eye and burnt a nerve, so when I give the evil eye I get the freakiest dimple.. It's a fun trick to pull on drunk people.. they seem to be amazed by it for hours.