The Makers of many common household cleaning agents have been reluctant to disclose the ingredients in their products. We'll be joined by Keri Powell, a lawyer for the environmental group Earthjustice, who filed a suit requiring manufacturers to come clean on what's in their products. We’ll also speak with industrial hygienist Monona Rossol from Arts Crafts and Theater Safety on why there’s been such resistance to comply – and what it means for our health.

You can hear Monona’s last appearance on the show on “dangerous household chemicals” here.