For delicate or antique rugs, they are placed between two screens to make certain the pile isn't nicked. Routinely vacuuming your rug helps keep it free of loose dirt, dust, and allergens in the top layers. They clean the ceramic surfaces, washbasins, toilets, floors and bathtubs. http://552.Strongrockholdings.com/__media__/js/netsoltrademark.php?d=Kafdp.Or.kr%2Fbbs%2Fboard.php%3Fbo_table%3Dfree%26wr_id%3D560409