Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to clean your iphone camera lens [title] Buy compressed air without chemical additives. [step] You can purchase compressed air at most department stores or hardware stores. Choose products that use only air and do not include chemicals.

Ending1: Your phone screen should work well with compressed air. [title] Turn the phone off for a few minutes to let the air cool. Ending2: Products like dust off and blow away work well. [title] Dispense the compressed air onto the lens. Ending3: [substeps] Also, when shopping for a photo-cleaning kit, make sure to use compressed air so it will help remove particles. For instance, if you're cleaning a polaroid disposable camera lens, a compressed air diffuser will help keep your camera flat and dust free. Ending4: [substeps] Open up a new and clean iphone camera lens shell and shake off any loose residue or debris. Take off the outer cover (both sides) of the lens shell so your camera lens can be clean.

Answer format: ending1/ending2/ending3/ending4