Ready stock 100% Genuine DEMITZE Anti Dust Mite Spray 500ml can be used on all the above including heavy curtains. The product contains benzyl benzoate, an EPA (USA) approved solution to be used as an anti-dust mite solution. It is Non-Toxic, Odour Free, Safe & Non-Staining, Biodegradable and Environmentally Friendly. Dosage : One bottle of 500ml Demitze Anti Dust Mite Spray is sufficient to cover 10 square metres of surface. Directions of use : 1. Vacuum items to be treated, eg. mattresses, pillows, fabric sofa, rugs, furry toys, carpets and curtains. 2. Evenly spray Demitze on the top side. 3. Allow items to air dry for 2 to 3 hours. 4. Use the treated items normally. 5. After 1 week, thoroughly vacuum the treated items to remove the dead house dust mites. 6. For best result, repeat the application every 3 to 4 months.