Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to clean old leather [title] Determine what kind of leather you're trying to clean. [step] Knowing the type of leather you have will help you select the correct cleaning product. Natural or untreated leather does not have a protective coating, while treated leathers do.

Ending1: Natural leather is more expensive than store-bought leather, but is more resistant to damage. [title] Check out the leather for air bubbles. Ending2: Choose a leather cleaner if your leather has the following : [substeps] An enzyme-based cleaner or a cleaner designed for leather. An oil-based cleaner, such as windex or linseed oil. Ending3: You can tell that your leather is untreated if it's soft to the touch and doesn't feel like it has a plastic coating. [substeps] Untreated and natural leathers may change color after you clean them. Ending4: There are at least two types of leather: non-treated leather and free-to-dry leather. However, if you don't know exactly what kind of leather you have, you may only need to clean leather suitable for your needs.

Answer format: ending1/ending2/ending3/ending4