INCI declaration of the ingredients:

Aqua, Alcohol, Isopropyl Alcohol, Lactic Acid, Aluminum Lactate, Eucalyptus Globulus Leaf Oil, Sodium Hydroxide

Further explanations of the ingredients:

Aqua:
Water. It accounts for around 65% of the weight of the human body and is therefore of fundamental importance for bodily functions, including those of the skin. In many cosmetic products (aqueous solutions, cleansers, emulsions), water is the ingredient with the largest proportion of the formulation in terms of quantity and forms the basis of the aqueous phase in emulsions. Water is a good solvent for polar (hydrophilic) substances such as alcohols, water-soluble vitamins or salts. For use in cosmetic products, the water used is generally pre-treated to remove microorganisms that could lead to spoilage of the product or dissolved salts that may impair the stability of emulsions or gels (sterilization and desalination).

Alcohol:
Ethyl alcohol: Body identical. Has a refreshing and antibacterial effect. Also serves as a solvent for other ingredients. Contrary to claims to the contrary, there is no risk of a drying effect on the skin at normal application concentrations!

Isopropyl Alcohol:
Iso-propanol: Has a disinfectant effect like ethanol, but unlike ethanol it also dissolves natural fats.

Lactic Acid:
Lactic acid. Occurs as a metabolic product in the body and on the skin, has a peeling effect on the horny layer in higher concentrations and at a low pH value of 2 to 3, supports the moisture content in buffered form (physiological pH value of the skin approx. 5.5) and preserves the skin's protective acid mantle.

Aluminum Lactate:
Mild, very well tolerated astringent, unlike other astringents it does not irritate the sweat glands. 

Eucalyptus Globulus Leaf Oil:
Eucalyptus oil: Antispasmodic, wound-healing and stimulating. Antiseptic, recommended for inhalation in respiratory diseases

Sodium Hydroxide:
Sodium hydroxide. Used to adjust the pH value of cosmetic products. Sodium and hydroxide ions are identical to the body.