Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to clean rat droppings [title] Ventilate the space where you will clean. [step] Open the doors and windows of the area where you need to clean the droppings. Ventilate this space for at least 30 minutes before you begin cleaning.

Ending1: [substeps] Try to open windows and doors until you smell the pungent odor. If you notice the smell coming from the same location before you use the vent, use this method immediately. Ending2: Make sure no children or pets are in this space while you clean. [substeps] Close fans and vents to reduce ventilation as much as possible. Ending3: If you are dealing with a very large number of droppings, wear a face mask or ventilator while cleaning. [substeps] Consider wearing an eye mask when cleaning after large infestations of rats. Ending4: [substeps] Avoid working in a humid and dry area. The fumes from cleaning your rat droppings irritate your eyes and the dry air can cause liver damage.

Answer format: ending1/ending2/ending3/ending4