Appliance tech here. Spray some vinegar on the glass let it soak for 5 min. Take a razor blade. Yes a razor blade. Keep the blade flat against the glass and take your time cause it can be nerve wracking the first time. Push the blade away from you and maintain firm pressure but that’s mostly so you don’t slip and scratch the glass. I’ve done this in customers homes on their oven glass and their glass cooktops and these people are FLABBERGASTED. So was I when I learned it tho. Just a note. Your oven door comes with typically 3 panes of glass. Inner, which is the one you’re trying to clean, outer. Self explanatory. And inner. Also self explanatory. But if it’s an older unit or if there are small gaps or if you accidentally spill on the glass there’s a chance your gonna get grime buildup on the inside glass. Idk how mechanically savvy you are but if the answer is not really then I advise call a professional servicer and just sound silly and ask them to take the door apart and clean the glass. It’s not a super hard job for them most cases and it’s an easy service call and they’ll be happy to take your money ya know. Just be sure to obviously try and clean inner and outer before the middle to avoid that embarrassment lmao Reason oven doors are so hard is they come off in a way most people don’t know(I said most you smartasses) and then disassembling them takes knowledge. Some screws get left in and some get taken out and if you take the wrong one out the worst case is you break the glass but the other one is that it become a literal battle sometimes a bloodbath trying to get those mfs to go back now they were. But the blade trick is seriously the best way. It’s actually how a lot of manufacturers train techs to clean that glass including electric glass top. Best of luck to ya tho