I have had this happen and have used the Mr. Clean sponge. Get it really wet. Lay on a thick folded towel, place hot iron on sponge and iron back and forth til iron is clean. It works great. I have used the iron cleaning product in the tube and find it gets into the vents and is very hard to get out and will mark your fabric. The Mr. Clean eraser is so much better. You may have to wet the sponge again and do it again.