In case of heavy calcium deposits on glass doors and wall tiles, we recommend an initial application of vinegar or citric acid, then allow these chemicals to settle for around 20 minutes. Continue to clean surfaces with steam nozzle and micro-fibre cloth or triangular brush with inserted micro-fibre cloth. You can clean any joints and grooves using the round nylon or brass brush. To remove stubborn stains you can also use the round nylon brush with stainless steel wool immediately on the glass.