Several methods can be employed to clear blocked drains in a house. One common approach is to use a plunger, which creates suction to dislodge the blockage. Chemical drain cleaners can also be effective, although they should be used with caution and according to the manufacturer’s instructions. Mechanical methods such as drain snakes or augers can physically break up or remove the blockage. Hydro-jetting, which involves using high-pressure water to flush out debris, is another option for more stubborn blockages. In severe cases or when DIY methods fail, professional plumbers may use specialized equipment like drain cameras to locate and remove the blockage efficiently.