If you want to clean and restore your stainless steel sink, try using a stainless steel cleaner or a paste made from baking soda and water. Gently scrub the sink with a soft cloth or sponge, then rinse thoroughly. For future cleaning, encourage your sister to use appropriate kitchen cleaners to prevent damage.

Thanks alot Ahmed

Ah, I understand. Since it's a motel and you don't have access to these things, I suggest you try using a lint roller to remove any dust mites from the surfaces in your hotel room. This will at least help to reduce the amount of dust mites in the room, even if it won't completely eliminate them. You can also try wiping down surfaces with a damp cloth to remove any dust and debris.