This one always pisses me off. If you aren't going to drink wine, never hold it by anything other than the stem because I have to polish that glass, and it wasn't necessarily water spot clean when I cleaned it the first time. As a server in fine dining and other types of restaurants for 40 years, I have cleaned hundreds of thousands of glasses of every type, and the ones I hate to clean are those a customer just handed me with their hands all over the bowl. Even bussers do this, and they should know.