Ugh, dump it, really? I totally see your point, but it seems so wasteful. I do have a few new bottles (stuff I bought back when I was still into drugstore shopping, so yeah they are old, but I don’t think that stuff expires), and a few that are opened, which I’m contemplating just using. I’ve used them for the past 30 years, what’s another month, right?

I have used options 1 and 5 in the past. #5 is not that wasteful if you have a legitimate reason for not wanting to use the product — which you do. If you add plenty of water to dilute the product before dumping it out (I usually let it dilute over the course of a day or two), recycle the container, and resolve not to buy the product again, you have done your part.