Pour salt into the bottom of the pint glass and scrub with a long handled washing up brush. The salt acts as an abrasive. Then plunge each glass into a bowl of warm soapy water. Splash out on good quality washing up liquid and use a tiny amount. It will make all the difference as smears on glasses can be caused by too much soap! Next plunge the glass into another bowl of warm water, but this time with a capful of white distilled vinegar in it. Finally, simply leave the glass to dry on a fresh tea towel.