The Mathematics Institute of Oxford University is the largest university building ever built in the last century. Designed by Rafael Viñoly architects, about 300 m2 of Spanish Blue Limestone were laid in the reception area and main staircase and 1,600 m2 of Cumbria porcelain tiles for the basement mezzanine floor. All materials were installed and carefully treated with Fila products by W B Simpson (MIDLANDS) Ltd for main contractor Laing O’Rourke. CLEANER PRO was chosen for the initial cleaning of surfaces. Thanks to its concentrated formula with neutral PH, it is the ideal detergent for washing acid-sensitive limestone like Spanish Blue Limestone. On a dry, clean surface, W68, the water-based stain protector for non-polished surfaces, was then applied, which contributed to the attainment of LEED credits and is GEV certified and marked EC1 Plus for its extremely low COV emissions. What’s more, W68 does not form any surface film and protects without altering the appearance of the material. For the initial washing of porcelain tiles laid on the raised floor – which includes the canteen area – DETERDEK PRO was used: the acid-based descaling detergent that does not emit harmful fumes and gives an exceptional deep cleaning without ruining the surface. In fact, unlike traditional products with hydrochloric acid, Deterdek does not harm aluminium and steel edges, respects grouting and is not hazardous for the user or the environment.