Does exactly what it claims to do. After filling with water and vinegar, you put it in the microwave and run it, then let it sit for a minute and after that you can wipe clean the entire inside with a damp sponge or paper towel. The smell of microwaving vinegar can be off putting. The manufacturer suggests adding a little lemon juice to the mixture to reduce the odor, but it didn’t seem to have any effect when I did it. The smell went away quickly and now my microwave is spotless after not cleaning it for months. I’m very happy with this product.