Just like a masonry chimney , a chimney that has been upgraded or repaired with a chimney liner still requires maintenance. Sometimes it is a requirement of the manufacturers warranty to make sure the chimney pipe is inspected and cleaned, as necessary.
It is important to sweep the liner with the proper type and size brush. Metal brushes are not ideal for cleaning these flues, the sweep will use special polypropylene bristle brushes to sweep the liner clean and clear any soot, creosote and/or debris.
Here are some pictures of what a chimney liner looks like before and after a cleaning:
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