We greatly reduce the microplastic exposure by providing our staff organic clothing. (And when I say organic, I mean natural fibers.)
We also greatly encourage our parents to dress their children with organic materials
We do not use plastic containers or tools in our kitchen, nor aluminum.
Most of the foods we consume are not stored in plastic, and we wash them if they are in contact.
We vacuum frequently and we filter our indoor air with HEPA filters.
We clean our surfaces with a mixture of water, hydrogen peroxide (antiseptic agent), vinegar (technically not a surfactant, but good enough), and natural pine/camphor/eucalyptus oils (for aroma).
The property has passed lead inspections
NOTE: I have legitimate concerns with childcare centers where they actively chose to use turf as a playground material. I would assume that that is a large source of microplastic exposure, especially considering that it is under everyday UV ray exposure, nature's best 'force of degradation'.