Pour a dab of the glass cooktop cleaner on the cooking field. With a moistened sponge (soft side) wipe and rub all over the field until it's foamy. Cooking debris can be scraped off with a spatula. With a wettend cloth wipe off all cleaner and loosened debris, until no cleaner remains, polish dry with a clean dry cloth.
For very persistant debris, give some drops of washing up liquid on a wet cloth. Cover the debris with the cloth and let sit for 15 minutes. Then take of the cloth and start with the procedure above.