Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to inspect parts using dye penetrant [title] Clean the part thoroughly using a suitable cleaner, acetone, aqueous degreasing, etc. [step] Allow the part to dry. Drying can occur using a hair-dryer or in air.

Ending1: If air-dried, allow enough time for the cleaning agent to evaporate from the defects. This may take several hours depending on the ambient temperature and cleaning material used on the part. Ending2: If you use a hairdryer set to " low ", it doesn't perform well, which can cause breakage. If you use a hair-dryer set to " high ", dry the area well for several days before using dye as it can help keep pigmentation from spreading. Ending3: [title] Make a stain-removing paste by mixing 1 tablespoon (15 ml) of hydrogen peroxide, ½ tablespoon (1 ml) of baking soda, and 1/8 teaspoon of rubbing alcohol together. [step] Brush the stain dry, and let it continue to soak overnight. Ending4: [title] Work the dye solution into the area where the defect is located. [step] Once the area is cleaned, scrape off the excess dye from the substrate.

Answer format: ending1/ending2/ending3/ending4