A laundry expert says some common mistakes when doing laundry include using too hot water and too much products.The Good Brigade/Getty ImagesZachary Pozniak and his father, veteran dry-cleaner Jerry Pozniak, own a luxury dry-cleaning company.They wrote about everything you'd want to know about laundry in their new book "The Laundry Book."Zachary, age 30, told Business Insider the top things to avoid when doing laundry.This as-told-to essay is based on a conversation with Zachary Pozniak, co-author of "The Laundry Book." It has been edited for length and clarity.I believe that laundry is a spoken education passed down through families.