We were called out to Santa Clara due to a foul smell and little gnat like flies that were driving our customer mad . Upon inspection in the crawlspace we noticed that the clean out cap had popped off due to pressure of the line being clogged up. We immediately recommend our customer to contact a plumbing company to clear the line so we could do our cleanup. The plumbing company arrived on scene and installed a two way clean out in front o clear the clogged main line . Onc