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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. While results are magnificent, to the architect and maintenance supervisor, what’s also magnificent is the fact that set-up, micro-abrasive cleaning and site cleanup all continue each night so not to curtail daily operations. Ms. Rayala, as *Duluth News Tribune* staff writer Brady Slater offered the best compliment in speaking about the other subsequent city building renovations… "Once they see what we've done," she said, "they'll be copying us." Travertine Restoration is very difficult when ordinary abrasives are used. Sponge-Jet microabrasives protect the soft travtine surface from gouging and visible damage that would be unavoidable if restoration was being done with another media like garnet.  **[Click here](http://www.duluthnewstribune.com/news/3781380-after-nearly-90-years-duluth-city-halls-walls-get-deep-clean)** to review the article and video to appreciate the work both companies are delivering. - [Tweet](https://twitter.com/share) [Historic Restoration](https://blog.spongejet.com/topic/historic-restoration) [Application Station](https://blog.spongejet.com/topic/application-station) [Stone Restoration](https://blog.spongejet.com/topic/stone-restoration) [Case Histories](https://blog.spongejet.com/topic/case-histories) Search this site on Google Search Google ### Categories - [Case Histories (41)](https://blog.spongejet.com/topic/case-histories) - [Historic Restoration (35)](https://blog.spongejet.com/topic/historic-restoration) - [Tech-Terminal (35)](https://blog.spongejet.com/topic/tech_terminal) - [Executive View (23)](https://blog.spongejet.com/topic/executive-view) - [Lead Abatement (22)](https://blog.spongejet.com/topic/lead-abatement) - [Application Station (21)](https://blog.spongejet.com/topic/application-station) - [Cleaning (18)](https://blog.spongejet.com/topic/cleaning) - [OSHA (12)](https://blog.spongejet.com/topic/osha) - [Safety First (12)](https://blog.spongejet.com/topic/safety-first) - [corrosion (12)](https://blog.spongejet.com/topic/corrosion) - [Stone Restoration (10)](https://blog.spongejet.com/topic/stone-restoration) - [Dustless Blasting (8)](https://blog.spongejet.com/topic/dustless-blasting) - [Fire Damage (7)](https://blog.spongejet.com/topic/fire-damage) - [Marine Industry (7)](https://blog.spongejet.com/topic/marine-industry) - [Robotica (7)](https://blog.spongejet.com/topic/robotica) - [Granite (5)](https://blog.spongejet.com/topic/granite) - [Coal Slag (4)](https://blog.spongejet.com/topic/coal-slag) - [Robotic Abrasive Blasting (2)](https://blog.spongejet.com/topic/robotic-abrasive-blasting) - [Railcar (1)](https://blog.spongejet.com/topic/railcar) see all ### Recent Posts ### Sign up for our blog. ![](https://blog.spongejet.com/hubfs/Spongejet-Oct2015-Theme/Images/find-rep-bg.png) ![](https://blog.spongejet.com/hubfs/Spongejet-Oct2015-Theme/Images/find-rep-img.png) [Distributor Locator](https://www.spongejet.com/find-rep/) ![](https://blog.spongejet.com/hubfs/Spongejet-Oct2015-Theme/Images/white-paper-bg.png) ![](https://blog.spongejet.com/hubfs/Spongejet-Oct2015-Theme/Images/white-paper-img.png) [Resources](https://www.spongejet.com/support/resources-support/resource-library/?k=&type=document-library&document-type%5B%5D=24&searchsubmit=Search+resource) ![](https://blog.spongejet.com/hubfs/Spongejet-Oct2015-Theme/Images/online-traing-bg.png) ![](https://blog.spongejet.com/hubfs/Spongejet-Oct2015-Theme/Images/online-traing-img.png) [Online Training](https://www.mytestcom.net/app/myTestcomURL.cfm?accountLogin=SpongeJet123&joinPasscode=SpongeJet123) [![spongejet](https://blog.spongejet.com/hubfs/Spongejet-Oct2015-Theme/Images/logo.png)](https://www.spongejet.com/) - - - - - [+1 603-610-7950](tel:+1-603-610-7950) - [Contact us](https://www.spongejet.com/contact/) Phone: +1 603-610-7950 | 14 Patterson Lane, Newington, NH 03801 USA - [© 2015 Sponge-Jet, Inc.](https://www.spongejet.com/copyright-info/) - [Contact](https://www.spongejet.com/contact/) - [Support](https://www.spongejet.com/support/) - [Privacy Policy](https://www.spongejet.com/privacy-policy/) - [Terms & Conditions](https://www.spongejet.com/terms-conditions/)