Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to clean hard water spots off windows [title] Fill a squirt bottle with half water and half vinegar. [step] The best vinegar to use is plain white distilled vinegar, which is inexpensive and effective. A higher concentration of vinegar may be even more effective, so adjust the vinegar to water ratio based on the severity of the water spots.

Ending1: [substeps] Distilled white vinegar has been used for centuries as a cleaner. If you see any of the vinegar splashing over surface of your window, and you take a closer look, don't assume that it's something suet-based. Ending2: [substeps] Vinegar is strong but does not react with chemically treated agents, so if the water spots are less severe, it may not be as effective as white vinegar. If you prefer to use distilled water, stir the solution according to the manufacturer's label. Ending3: [title] Spray the vinegar solution on the glass. [step] Spray the solution on the glass, being sure to fully saturate any stubborn water spots or areas of concentrated buildup. Ending4: [substeps] If you have weak spots on your windows that you want to wipe off, distilled white vinegar may be better to use. [title] Unscrew the cap from the bottle.

Answer format: ending1/ending2/ending3/ending4