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To get rid of the smoke smell in a microwave, scrape off any burnt food residue and throw it away. Next, warm a cup of water in a microwave-safe container for three minutes. Then, dip a microfiber cloth into a mixture of water and a couple of drops of dish soap and wipe down the inside of the microwave. Dry the inside of the microwave with a fresh cloth and let everything air out for three hours.

One of the easiest ways to make dull oven racks shiny is to soak them overnight in hot water and dishwasher detergent. After leaving them for at least 12 hours, use a scrub brush or sponge to remove the stains. For best results, repeat the cleaning process every few months to keep your oven racks bright and shiny.

In general, yes, it's worth repairing an appliance over replacing it. If the repair will give you more years of reliable service from the oven and the repair costs less than buying a comparable new model, then yes, get it repaired. If, on the other hand, the oven is reaching the end of its life and needs a costly repair, you're likely better off buying a new oven.

Appliances that are smudge-proof stainless steel have a protective clear coating that makes them smudge-proof. Unfortunately, you can’t truly remove a scratch on this surface without also removing that special coating. Your best bet is to let the scratch be or protect it with a small dab of clear nail polish. 

You can risk the option of buffing out the scratches, and be very diligent in coating the area you buffed with oil to reduce the dullness. Just know that if you choose to buff it out, there’s a possibility that the spot won’t look the same as the rest of the appliance.