as possible with a sharp blade. A razor blade will do the trick and shouldn't harm the glass. If you manage to get the blob of glue off this way, simply wash off the residue with warm, soapy water, rinse and let dry.

How would you rephrase that briefly using Vietnamese?
Cố gắng loại bỏ keo càng nhiều càng tốt bằng lưỡi dao sắc.