mud in drain line

[AmericanIdiot]

I have a drain system from my shower that is clogged with mud. The drain is the kind tht pipes right into the lawn underground not to the septic tank. I have dug and exposed the end of the drain. I have tried to get the mud out but its very deep in the line. How do I get the mud out?

[suemarkp]

Run a half inch plumbers snake into it and flush water down it after you have a hole all the way through the mud; or turn on a garden hose with a large flow and jam it in and out of the pipe to blast its way in while blowing out the mud that gets loosened up.

Both of these should be done from the yard size hole. Be sure to use a clean drainrock backfill and cover the top and perhaps sides with filter fabric so it doesn't clog again. How long is the perforated "drain pipe"? You may need to just dig out the whole pipe and do it over again correctly. I'd use rigid poly pipe with holes and not the black flexible stuff, and probably want at least 40 feet in a 1' x 1' gravel bed.