Back when I was still working at a cattle farm (yup, I worked in one! actually, in two farms! lol), we sometimes had problems with our drainage system. It would get clogged. My boss then wanted to get one of those pressure washers another farm owner recommended. We looked everywhere for a good deal (it was kind of hard, since they weren't as common as they are now); believe me, it took as weeks! We found some, but they were pretty expensive and hard to handle.
Finally, we settle for a slightly expensive brand but it was well worth it! The incidence of clogging was dramatically reduced. :)