Cleaning Service Rec for Allergies?

Our 18 year old cat sadly had to be put to sleep last week. As sad as it is to loose the cat, we’re hoping it means our son’s recently diagnosed allergies will improve. (he’s allergic to cats and dust). So we’d like to get a really thorough cleaning done of our apartment. A friend told me there are cleaning services that specialize in ridding your house of cat dander (and other allergens). Can anyone recommend one? Thank You!