Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to remove carpet glue from concrete [title] Fill a bucket with 1 gallon (3.8 l) of hot water. [step] Fill a large bucket with about 1 gallon (3.8 l) of water. The water should be too hot to touch comfortably but it does not need to boil.

Ending1: [title] Push the carpet glue into the bucket. [step] Make sure the bucket is big enough for the entire carpet glue to fit fully inside. Ending2: [title] Clean the surface by spraying it with an upholstery protectant or applying a heavy grease-based scouring pad. [step] Keep it wet to make it easier to remove the glue and get rid of fluff. Ending3: [substeps] If you used the removal method instead of washing the carpet in the bucket, soak the carpet container in the hot tap for 50 to 100 minutes. [title] Lift the carpet up off the water. Ending4: You will use this base to create a glue removal solution. [title] Add 2 cups (470 ml) of ammonia and 1 cup (240 ml) of liquid detergent.

Answer format: ending1/ending2/ending3/ending4