Washing solvent: > 90 # gasoline or tetrachloroethylene.

Washing method: put the leather coat flat on the washing table, scrub the greasy part of the leather coat with a sponge or cotton ball dipped in a proper amount of solvent, remove the greasy part, slightly wet the scrubbed part with a towel dipped in hot water at 40-50 degrees Celsius, and dry it in a ventilated and cool place.

Large area oil pollution treatment

Cleaning solution:

Solution A: 95% alcohol and 25% ammonia, with the ratio of 1: 1.

Solution B: 25% ammonia water, softener and water in the ratio of 1: 1: 1.

Washing method: put the leather coat flat on the washing table, dip it in solution A for pre-washing, wipe it with a towel while brushing, absorb dirt and dirty liquid, dip it in solution B for secondary cleaning after oil stain removal (the method is the same as above), and put the towel in a ventilated and cool place to dry after cleaning.

Treatment of old skin color

Cleaning solution:

Solution A: detergent and water, the ratio is 1: 400, the concentration is 0.25%-0.3%, and the water temperature is 35-40℃.

Solution B: brightener, slip agent and water in the ratio of 1: 1:4.

Washing method: lay the leather coat flat on the washing table, lightly brush it with a brown brush dipped in solution A, and wipe it clean with a towel while brushing. After the oil stain is removed, scrub the wet leather surface with a sponge dipped in solution B, let it stand for 15 minutes, wipe the towel clean and put it in a ventilated and cool place to dry. 4. Denitrification and hardening treatment of leather surface

Cleaning solution:

Solution A: sodium sulfate, salt and water in the ratio of 1: 1:2 (dissolved and mixed); Usage: 250g of sodium nitrate, 250g of salt and 55g of soft water.

Solution B: fatliquor (water-based) slip agent, softener and water, with the ratio of 1:2:2: 10 and the water temperature of 40-45 degrees Celsius.

Solution C: formaldehyde and water in the ratio of 1:8 or 1: 10.

Washing method: lay the leather coat flat on the washing table, repeatedly brush the leather coat surface with a brown brush dipped in solution A to make it fully penetrate into the leather coat, let it stand for 30 minutes, repeatedly and evenly scrub the leather coat surface with a plastic cleaning ball dipped in solution B, let it stand for 15 minutes, clean the surface with a towel, put the leather coat on the portrait airplane model, spray solution C evenly on the leather coat surface with a spray gun, and put it in a ventilated and cool place to dry.