Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to fix scratches on an aquarium [title] Clean the outer surface. [step] Spray the surface with acrylic safe cleaner. Use enough cleaner so that the surface is sufficiently wet.

Ending1: Wipe it clean with a soft cotton cloth, freeing it from dirt and dust. Work with a clean surface so you don't add additional scratches as you work. Ending2: It's best to do this right after you've applied the solution. Let the clean surface dry before proceeding to the next step. Ending3: Then scrub the glass with a scrub brush. [substeps] If possible, use a buffer so that the scratches will not impact the glass when it is exposed to air. Ending4: The excess water can free the scratches, or destroy the surface. Fill a small bucket with clean, mild water.

Answer format: ending1/ending2/ending3/ending4