Troubleshooting My Philips Dehumidifier smells bad or like plastic If your Philips Dehumidifier produces a bad odor, please find out the possible causes and solutions here. First times usage (plastic smell) The first times you use your Philips Dehumidifier, it might produce a plastic smell. Do not worry this is normal and the smell will fade away. The filter is dirty (bad smell) A dirty filter can produce a bad smell. If this is the case, please clean or replace the filter as recommended for your specific dehumidifier.