Dimethicone lotion recommended by the RIVM

Dimethicone lotion is a type of silicone oil used in shampoos and conditioners to give the hair more smoothness and texture.

There's a good chance you've already used dimethicone in another product. An additional property of high-dose dimethicone is that it effectively eliminates head lice. The properties of dimethicone according to Wikipedia: The liquid is clear, colorless, viscous, chemically inert, harmless, non-flammable, and is virtually insoluble in water.

Harmless

Dimethicone lotion is harmless for use on hair is evident from the fact that dimethicone is also added to food products, namely to jams, marmalade, fruit and vegetable conserves, fruit juices, soups, and (frying) fats. It is permitted in the European Union under the E-number E900. The acceptable daily intake (ADI) is 1.5 mg/kg body weight.* Of course, oral use of LuizenWeg is discouraged. Because you can apply it locally via the handy dosing nozzle, it's easy to prevent the lotion from getting into eyes or mouth.

On this government site, you can see more examples of products containing Dimethicone: https://waarzitwatin.nl/stoffen/dimethicone

Dimethicone works better than natural oils like olive oil, tea tree oil, or neem oil. Dimethicone penetrates so deeply that it affects the louse in another way, preventing it from excreting and thereby being eliminated within minutes. Natural oils need 8 hours to suffocate the lice, as lice can survive without oxygen for that long, which is why swimming does not help against a head lice infestation. The louse breathes through body openings and has a tracheal system to supply oxygen and excrete CO2 and water; this fine system is deeply penetrated by dimethicone, causing functions to fail.