KnocKnocK is the NO. 1 On-Demand Dry-Cleaning & Laundry App in Singapore! Free pickup & delivery. In 20 seconds, you can put your laundry order via the App, our well-trained Woodpecker (worker) will come to pick up your clothes at your doorstep, and it's all FREE, no extra-charge and no tips required! Why KnocKnocK? Premium quality services.