I don't know how you would go about lessening the amount of insects on moss, but other plants you can wash all the dirt off them, and then wash it in mildly soapy (dishsoap) water (do not wash the roots, just the foliage...turn it upside down and stir it around the water) and rinse well and plant in topsoil (not potting soil, it has undesirable additives in it).
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