Please choose the correct ending to complete the given sentence: Youth: [header] How to remove mastic [title] Soak the mastic in hot water. [step] This will only work on some types of mastic, usually in recent homes. It's worth trying first, as wetting the mastic can make other methods safer.

Ending1: [substeps] Place a piece of paper or cloth on top of the mastic. Pull the paper back gently so the boric acid is exposed to the water. Ending2: When you submerge the mastic in the bath, it should soak for one to two minutes before it seeps out. [substeps] Soaking in hot water, however, can damage the surface. Ending3: [substeps] Do not use soap during a mastic soak. It may irritate the mastic deeper than you like, resulting in accidental sores. Ending4: You should notice the mastic loosening within 20 to 60 minutes. [substeps] Mix the hot water with vinegar or citrus degreaser for extra strength.

Answer format: ending1/ending2/ending3/ending4