Wire coat hangers (can puncture modern plastic pipes) or caustic drain cleaners (don’t dissolve leaves/moss, dangerous if splashed). Final verdict: Most downpipe blockages are caused by leaves and roof grit at the first bend. Start with hand cleaning and a plunger; escalate to a wet vac or jet nozzle. Call a drain specialist only if you’ve tried rods or jetting and still have standing water after heavy rain.
Garden hose with a jet nozzle and a rag seal – almost free and surprisingly effective. how to clear a blocked downpipe
Wet/dry vacuum from the top. It’s safe, fast, and works on 80% of standard downpipe blockages without any pipe disassembly. Wire coat hangers (can puncture modern plastic pipes)