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By the time the cleaning crews arrived, class and function rooms had already been cleared out, with tables, chairs and other furni- ture neatly arranged in the hall. The cleaners could get to work immediately and ensure a thorough job. In the course of their work, they also removed chewing gum, marker traces and other tough stains. In the class rooms they gave blackboards, sinks and permanently installed equipment a full makeover. A cleaning pole and a single disc scrubber The next step was to start with basic cleaning in earnest. “Because the new floor finishes had to cure for at least 24 hours before bear- ing any loads, our team got started on the linoleum flooring in the classrooms first,” explains Jäckel. A pre-formulated dosage of a solution containing a special-purpose cleaning agent (Li-Ex, Kiehl) was used to remove marks and detergent residue from the pre- vious school year. This intensive cleaning, anti-foaming product was specifically developed for use on both alkaline-sensitive and alkali-resistant flexible flooring, but also for natural and artificial stone. It removes polymer coatings, maintenance coatings as well as oil and grease stains. First, the solution was applied to the edges with a pad on a pole, then the whole floor area was scrubbed with a single-disc machine. “Green pads safely loosen and capture dirt without damaging the floor,” he emphasizes. The fifteen minutes it takes for the product’s action to unfold were used to prepare the cleaning process in the neighboring classroom. After letting it soak for the required time, the solution was removed with a wet vacuum cleaner. The final step was a neutralizing process which consisted of wiping the floor down with clear water that contained a splash of alcohol-based cleaner (Lorito Otto Oehme GmbH). Where and when possible, the As was previously done in the classrooms, a metallic dispersion was windows were left open to allow air to circulate and the floor to dry. finally applied to the stone floors in the hallways and worked in with a flat mop. Photos: Wylegalla Give basic cleaning the time it takes Finally, the Aedes team coated the PVC floors with a metalized plastic dispersion (Thermodur, Kiehl) – a product with a high tenance cleaning. In order to get the work done as effectively and solids content that results in a self-shining floor finish. It is durably hassle-free as possible, good time management was necessary stain and smear-resistant and skid-proof. An adhesion test is re- here, as in the other areas. commended, however, before using it on PU or PE top layers. In the First of all, the sanitary appliances were thoroughly cleaned. To classrooms in the Erich Kästner School, the coating process was remove lime, urine and scale deposits in the bowls, Aedes as usual carried out manually with a broad wiping apparatus. One applica- relied on tried and tested Nettesheim’s Clonett biodegradable con- tion is not enough however: “You need a great deal of experience centrate. This product acts as a disinfectant, sticks well to the sides and a strong sense of the required quality to be able to judge when of the toilet bowl due to its viscous consistency and, if left to act the optimal result has been reached,” Jäckel points out. As a rule, long enough, even removes stubborn stains. the Aedes crew apply two finishing coats, with an interval of one hour between passes. Badly worn floors may require more coats, Restrooms get special attention of course. This work can be very time-consuming, so contractors The exterior of the sanitary appliances, the fittings and the wall should carefully inspect the premises and accurately take the time tiles were cleaned with an acid-free sanitary cleaner (Säfresan factor into account when costing an assignment. In Fürstenwalde, 358, Otto Oehme GmbH). Based on specific complexing agents, the floors were as good as new and ready for the onslaught of kid’s this cleaner unfailingly removes limescale, lime soap residues shoes after just a day of curing with good ventilation. and stains without affecting materials and stone floors that The restroom tiles, too, underwent basic cleaning, using the are sensitive to acids. The product can be used in somewhat same cleaning measures regularly carried out during the main- higher doses for tough stains and if necessary can even be used GLOBAL CLEANING | ISSUE 2016 29


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