Before injecting hot-pour rubberized sealant into asphalt cracks, how must the cracks be cleaned and prepared?

1. Filled with loose soil and watered thoroughly to pack the crack.
2. Coated with heavy motor oil to keep the sealant liquid indefinitely during curing.
3. Cleared of debris using high-pressure compressed air or a hot-air lance.
4. Sealed over with duct tape to retain internal moisture during heating.