Karcher T300 Hard Surface Cleaner for Karcher Electric Power Pressure Washers (Deck, Driveway, Patio, Tool Accessory) The Karcher Promise: cleaner. Quicker. Karcher T300 surface cleaner tackles large, surface cleaning tasks in no time. Comfortably clean decks, garage floors, driveways and patios with ease. With a large 11" diameter cleaning head, variable pressure dial and 32" wand Extension, the T300 surface cleaner is ready to tackle your biggest jobs. Locking joint allows Extension wands to lock vertically for breaks or compact storage.