Slow draining bathtub: what should I try first?

Yes, these work very well on slow drains. On a really plugged drain- not so much.

And as you noted, comparatively safe. Not that I’d encourage a toddler to eat a spoonful, mind you.

So, off-the-shelf products specifically designed to remove drain clogs are a scam?

Like fuck: I’ve used them for years and they work EXACTLY as advertised.

Not a scam, per se. But they *are *very dangerous, and if used improperly (and most dudes won’t use them properly) they can actually damage the plumbing. And, if they don’t work, then you’re extra fucked. The “scam” here is in selling these as cure-alls, when in fact they are only good for certain problems, only when used as directed, and only when you take proper precautions.