Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to clean a memory foam pillow [title] Remove the pillowcase and wash it as directed. [step] As soon as you've spilled something, remove the pillowcase and check its care instructions label. Soak it in cool water or wash it according to its care instructions immediately to prevent staining.

Ending1: [title] Decide if your memory foam pillow has a preservative that can damage the memory foam. [step] Preservatives like alcohol and detergent, as well as chemicals like powdered soda and food coloring and caffeine are grounds for memory foam mishandling. Ending2: Otherwise, dirt and chemicals can damage or even reshape this memory foam pillow. [substeps] If your memory foam is particularly old, please try a new pillowcase rather than another pillow! [title] Wash and dry the memory foam pillow. Ending3: [substeps] Using a liquid-proof pillowcase or pillow protector will help keep your memory foam pillow clean. Since washing it isn't as simple as throwing it in a machine, stain prevention will save you the hassle of more frequent cleanings. Ending4: This is crucial, as moisture can contaminate the memory foam from the cleaning process, resulting in unwanted stains. [substeps] You can also grease the memory foam pillows with olive oil.

Answer format: ending1/ending2/ending3/ending4