Kshir Samudra Tap is not a standard, widely attested term in the core Jain suttas. If you mean the generic idea of “tapas” (austerities) connected with the Jain cosmology around the Milky Ocean, here is the precise Jain context you might be referring to:

• Ksiroda(śamudra) or Kṣīrodasamudra is the Milky Ocean that surrounds the continent Ksīravaradvīpa in the middle world (madhyaloka) of Jain cosmology. This ocean and its surrounding dvīpas are described in canonical Jain texts and mark the geography of the universe in both Śvetāmbara and Digambara literature. The middle world is the only realm where humans can live; Ksiroda is one of the many oceans named after its characteristic substance (milk).
• Tap (tapas) in Jainism refers to ascetic practices aimed at purifying the soul and reducing karmic bondage. There are many forms of tapas (dravya, kshetra, kal, bhav), but they are generally described as personal vows and disciplines undertaken by mendicants or devout laypeople, not a single, unique rite tied specifically to a place like Ksiroda.
• If there is a specific phrase or tradition you’ve seen (for example, a regional or modern practice called “kshirsamudra tapasya” or something similar), it would help to have the exact wording or text. In the classical cosmology, however, Ksiroda is the Milky Ocean around Ksīravaradvīpa, not a named, separate tapas method.

If you want, I can give a simple, authentic Jain explanation of Ksiroda and its role in cosmology, or explain the general forms of tapas and how they are regarded in Digambar and Śvetāmbara traditions.

(Note: I’m keeping the explanation strictly within Jain cosmology and the traditional meanings of tapas as taught in Jain sources.)