Your roof is an essential investment that requires regular maintenance. Most roof washes cost less than 5% of the cost of a new roof and will ensure its optimal performance. Regular cleaning will also ensure that your gutters flow correctly and will keep dirty water off your siding. Taking care of your roof is an important task that is often overlooked. Staying up on roof washes ensures your roof will be living its best and longest life. If you wait until you see moss growing, the damage has already been done. Every home is different, and the intervals between roof washes will vary based on location. Some clients in more wooded areas such as Glacier and Sudden Valley need their roofs washed and cleaned every year, while others in farmland such as Lynden and Ferndale may only need their roofs washed every three to four years.