Plastic shower liners are less expensive and effective. They cost a few dollars and are available at most grocery and home furnishing stores. They are less prone to mold and mildew than cloth liners, but they will likely need to be replaced more frequently. Fabric liners, on the other hand, fabric liners are more aesthetically pleasing than plastic liners but require a little more upkeep. They need regular cleaning since they are more prone to mold and mildew. Fabric liners may be cleaned far more easily than plastic liners, though.