A bit too transparent

The new Daz 'Cleaner Close' ad claims that said product removes the dirt you can't see.

Whhhhhaaat?

The dirt you can't see is not dirt. Surely by definition, dirt is something you can see.

I refuse to start wondering whether my washing powder clears away mystical, intangible, unseeable dirt. Good heavens, the embarrassment of having transparent stains on my smalls!

I know it's the ad people's jobs to find new things for people to worry about and therefore market a product to it, but invisible dirt... ?