Steam cleaners are safe to use for the oven. You should select a vapor steam cleaner, which will do the cleaning in one simple step. You may also need different kinds of attachments to clean inside and outside the oven. Normally, a flat scraper tool is best to use inside the oven. It not only removes all residues but melts the grease and leaves your oven like a new one. Round bristle brushes are good to use on racks. To clean the oven glass from the inside, you should use a microfiber head brush, while outside, you need a window squeeze attachment to clean the glass.