These days, you can find out how to disinfect books on a librarians’ thread on Reddit. Your best bet appears to be either denatured-alcohol swipes or kitchen disinfectant in a mist-spray bottle, although if you stick books in a little oven and heat them to a hundred and sixty degrees Fahrenheit there’s a bonus: you also kill bedbugs. (“Doesn’t harm the books!”)
Is the sentence “Doesn’t harm the books!” an imperative sentence? (But I usually see imperative sentences starting with “Do/Don't” as the teacher says it omits the subject "you"， but I haven't met this kind that starts with "Doesn't".) Does is mean "Please pay attention not to harm the books when heating the book!" or "Take it easy! This operation won't harm the books!" ?