Firstly, check the condition of the technological holes: are they not clogged with dirt, fluff or other foreign matter? Next, check the tightness of the rubber cap around the bulb. Fogging may be the result of improper installation of the cap after replacing the bulbs. Thirdly, check whether the headlamp itself is sealed. To do this, remove the headlight completely and pour distilled water into it. If moisture begins to seep out at any point, mark the area with a marker. Then dry the headlight thoroughly and seal the holes with a special (silicone or polyurethane) sealant. This will not be possible with household glue or tape.
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Condensation may also be caused by small cracks. In this case, contact a car service and replace the part with a new one.
