WS144 - CAUTION CLEANING IN PROGRESS sign Where packaging costs less.... WS144 - CAUTION CLEANING IN PROGRESS sign Available in three sizes Choice of either RIGID or STICKER RIGID = A solid sign made from quality 3mm thick Foamex plastic board, light weight, strong and durable, easily drilled, suitable for internal and external fixing. STICKER = A self adhesive Vinyl sticker , perfect for easy display, just peel and stick where necessary . SAV signs. WS144