Selleys Sugar Soap is a salts based cleaner and can leave marks or streaks on glass surfaces especially if the dilution rate is quite high.
The best way to remove these marks is to use Hillmark Cerapol Ceramic Glass Cleaner which is specially formulated for cleaning and polishing glass. Apply and rub vigorously with a clean, soft cloth or paper towel, then wipe over with a soft cloth or paper towel.
For ongoing maintenance we recommend using Selleys Complete Clean Glass & Mirror Spray to remove dirt, spots and fingerprints from the glass surface. Leaves a brilliant streak-free shine.