Tappet
LE

Hi All,
I'm a firm believer in preventative maintenance, as it's less hassle and costs less in the long-run (I'm part northern). Having just moved into a new house, I've been cleaning all the traps out from under the sinks, and the other internal pipework where I can. There was a significant amount of sludge in there (now gone), but it led me to thinking if there was a way in which I could clean out the drain that runs under the back garden, without resorting to rodding it out.
Is there any chemical / solution that you'd recommend throwing down there to break things up / leave the underground pipe sparkling clean?
I'm a firm believer in preventative maintenance, as it's less hassle and costs less in the long-run (I'm part northern). Having just moved into a new house, I've been cleaning all the traps out from under the sinks, and the other internal pipework where I can. There was a significant amount of sludge in there (now gone), but it led me to thinking if there was a way in which I could clean out the drain that runs under the back garden, without resorting to rodding it out.
Is there any chemical / solution that you'd recommend throwing down there to break things up / leave the underground pipe sparkling clean?