Mr. Clean
Mr. Clean is a mainstream P&G cleaning brand with no plastic-free positioning. The Magic Eraser is its most relevant product here and its most problematic: it is melamine foam - a poly(melamine-formaldehyde) plastic - that cleans by physically wearing itself away, shedding microplastic particles onto surfaces and into water as designed. The brand is documented here so people searching for the Magic Eraser understand what it is made of.
How clear are their specs?
P&G doesn't foreground the material on packaging, but its own patents name the melamine-formaldehyde foam and the "just add water" marketing doesn't mention that the foam is a disintegrating plastic.
Products to avoid
Documented so you know what to skip — each still has a full breakdown and sources.