French drain cleaning

Do it right, and install perforated pvc pipe. Corrugated is thin, and will tear easily, so careful with a snake. Make your own water jet with pvc, and a cap with holes drilled into it, and attach it to your hose.

If you have a decent size gasoline pressure washer you could purchase a “Clog Hog” (sewer jetted) hose LINK, or knock-off equivalent, and see if that works for you.

I use one to clean my lawn drainage pipes and I’ve always been able clear blockages with it. My blockages always seem to be sediment that builds up in the drain pipe that either reduces flow or stops water flow altogether. The sewer jetter cuts right through it.

My lawn drainage system is solid sewer pipe and not corrugated pipe so I can’t tell you if a sewer jetter would possibly damage the corrugated pipe - perhaps other posters can comment if they have personal experience with this. Also there are cheaper knock off versions of sewer jetters, that are not the “clog hog” brand (I personally have the clog hog brand), that you can purchase on line, and in past threads on this topic other posters have stated they work fine.

That black corrugated crap is GONNA hold debris in the accordion expansion points. Cleaning won’t help. You can get the pipes clean, but if the perf holes are your goal maybe never. Roof crumbles are the worst (if it’s hooked to your gutters)