Pop an EcoDrop into a clean 750ml spray bottle, fill to the top with water, screw the spray-top lid on and give it a good shake. Leave the drop to dissolve completely and then you can get to work. Spray the glass from 20cm away, leave it to work its magic for a couple of minutes and then wipe with a clean, damp cloth. Don’t forget, if you’re using an old spray bottle, rinse it before use and affix the stickers included in the pack.