The answer to 'how to unclog pipe repair' is to first try using a plunger or a drain snake to clear the clog. If that doesn't work, you may need to disassemble the pipe to remove the blockage. Start by locating the clogged section of pipe, which is often under a sink or behind a wall. Use a wrench to disconnect the pipe and inspect it for any debris or buildup that's causing the clog. You can then use a wire coat hanger or other tool to dislodge the clog. If the clog is deeper in the pipes, you may need to use a plumber's snake or auger to reach it.
It's important to wear gloves and eye protection when working on pipes, and to turn off the water supply before disassembling anything. If you're not comfortable doing this yourself or the clog is severe, it's best to call a professional plumber to handle the repair.