I had same problem with my BME280. I used some isopropyl alcohol and then hotair station, 100°C/212F. Spray some isopropanol, let it sink in for a few seconds, then blow hot air for a while. Cool down and repeat few times. You can do it with live feedback, to check if it works. If it starts working, just repeat this steps few times and wait for readings to stabilize. It worked for me, but am not sure if its not just temporary fix.
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