why did Cascade liquid detergent stain my glass cooktop and how do I get it off?

Question

It left a white residue on the black surface and I can't seem to blast it off. Has anyone else had this experience?

Answer 1

You should only use products designed for these cook tops.
There is a product called Cerama-Bryte available at Home Depot.
Use this product and a razor to scrape hard residue loose.

Answer 2

It sounds like it dried and powdered and maybe it could have cooked on. Usually windex works well in this application. If the soap had a bleaching agent in it, the stain will be set.