Wash a Deck? It depends. Composite decks from brands such as TimberTech and Trex often resist deep staining and clean nicely with a light scrub, followed by a rinse with a garden hose. But if that isn ...

For the low-pressure surface cleaners we used a 1,800-psi 1.1-GPM electric pressure washer. A 4,200-psi 3.2-GPM machine served as the tester for the most powerful surface cleaners.