Sunlight will break down the product in a relatively short period. The exact time for this will vary depending on the strength of the UV light. Even under weak UV, the dyes will break down in a matter of days.
Drain Dye is hydrophilic, (that is, bonds readily with water), therefore, it is easily cleaned up with, or washed away with water. To speed up the process household cleaning bleach can be used to break down drain dye. Always use bleach in accordance with the manufacturer’s instructions.
To prevent staining, always test the product on a small non conspicuous area prior to use. If the product is difficult to remove from the substrate find another method or product to test for leaks or water flows.
Always use Red Back Drain Dye as per the MSDS.