FILTER.
Right, yeah. I guess I'd avoid the more popular stuff like Pepper-Up potions, unless some of the Muggles already know of us being here? That's the part that gets a little confusing. If we're supposed to lay low or just accept that we're here and milk it for what it's worth.
But yeah, something for clear skin and hair growth wouldn't be a bad idea. It wouldn't hurt to start selling something online, I guess?