Fighting moths with Trichogramma insects

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With barely any knits not touched by moths I am desperate to find a more or less reliable method. There is a company on the Internet that promises natural moth control with tiny Trichogramma insects that feed on moths larvae. Has anybody tried this method? It's really attractive as it doesn't seem to involve harsh chemicals. Many thanks.

No, but I have had very good results with a hot tumble drier to kill the grubs and eggs, and wardobe-hangers containing transfluthrin to kill anything in the wardrobe, plus intensive vacuuming of carpets especially under and behind furniture. It is very important to seal the clothes in a plastic bag or crate after cleaning to prevent reinfestation.

Not sure if "harsh" is the right word for the mothkillers.