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Wiktionary
defatting

n. The removal of fat from something, either physically or chemically vb. (present participle of defat English)

Wikipedia
Defatting (medical)

Defatting is the chemical dissolving of dermal lipids, from the skin, on contact with defatting agents. This can result in water loss from the affected area and cause the whitening and drying of the skin which may result in cracking, secondary infection and chemical irritant contact dermatitis.

Usage examples of "defatting".

When they touched the topic of the defatting shower again he perked up from his brooding and his face assumed a vivid expression.