Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to use starting fluid [title] Store starting fluid safely. [step] Starting fluid is highly flammable and combustible. Store and handle them safely.

Ending1: Using the starting fluid may speed up the process of combustion, especially if it is at an extremely high temperature. [substeps] Use the starting fluid at the very first chance you obtain. Ending2: Allow it to cool to about 60% for 24 hours, which is ideal for cotton. For fuller storage use, place the large pieces in a separate canister. Ending3: Clean and remove some essential oils to use. [title] Re-plug up the water pipes. Ending4: For instance, do not place your can of starting fluid on a hot engine or spray it near a hot engine. [title] Do not use excessive amounts of starting fluid.

Answer format: ending1/ending2/ending3/ending4