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Pongthep Charnchaichujit (original design)
Cleansing Gel, which may or may not be ordinary Water, is a testing element used in the Enrichment Center several decades before Portal and introduced in Portal 2. It is one of four types of Mobility Gels.
- Cleansing Gel is used to completely cleanse other Gels during tests. This can be used to add difficulty to said test by restricting the player's progress, or help the player by washing off testing elements covered in other less helpful Gels.
- Cleansing Gel behaves in exactly the same way as other gels and can be sent through portals in the same way.