Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to clean cedar shingles [title] Conduct a soft wash on your roof. [step] A soft wash, also known as a non-pressure wash, is where you take low pressure water and spray down a surface. This is important, as standard high pressure power washes might damage cedar shingles.

Ending1: [substeps] Use a 12-volt pump system with pressure of about 60 psi. [title] Scrub the shingles with a bristle brush. Ending2: [substeps] Cast iron can work, but a stick shamer can do that. Do not use soap when washing or steaming cedar shingles. Ending3: [substeps] Run your cloth under the water and wring it out until it is wet, but not dripping. Place a layer of pine straw under the cloth, then lightly wipe down the surface of the roof. Ending4: Start the wash by turning on a low speed. Look under the gutters and under the lower roof.

Answer format: ending1/ending2/ending3/ending4