This sample letter has choices to help you build your letter. When you write, pick the words that describe your situation.Learn about the requirements for preparing and filing a civil complaint, including how to prepare a summons, along with some cautions. Use this sample letter and these tips to write an effective complaint: Be clear and concise. The essence of a good complaint letter is to keep it short, pragmatic, and unemotional. Remember that the point of your letter is, first and foremost, communication. And remember that brevity is the soul of wit. One of the most effective forms of establishing valid claims for relief is called the 3-step Cause of Action. That is what is presented here. Use our online portal to file a complaint or concern in unincorporated Clark County, Washington – it's fast and easy!