Duluth City Architect, Tari Rayala chose Sponge-Jet as the solution to clean the Duluth City Hall’s high profile, travertine limestone interior walls. Nearly a century of cigarette smoke, “dirtier forms of heating” and oils from visitors bumping the walls, left obscured the creamy fresh look that the stone can deliver. Premium Plant Services and Sponge-Jet are teaming up to complete the cleaning and restoration of the two story project.
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