I'm a massive fan of bicarb and vinegar. A while back I swept bicarb into all the tile grout and made a paste with vinegar to stick into the shower walls. Then scrubbed with a good solid brush and it looks amazing. Still does months later.
I did the same thing today with the oven. Take all the racks out, soak for the day sitting on a towel covered in hot water and detergent in the bath before scrubbing all the muck off.
Vacuum oven for large particles, sprinkle with bicarb, spray with vinegar leave for an hour. Spray again with vinegar, scrub, wipe clean.
Sparking and non toxic!! Love it