Cleaning residual Coolube from parts
In most cases there should be little if any Coolube left on the part. If the part has much oil on it, it may be an indication which means the MQL spray needs adjusting. But in the cases where over spray is unavoidable, or there can be no oil on the part at all, Coolube is easy to wash off.
Coolube is oil, so a simple alkaline based detergent is sufficient for cleaning. Alkaline cleaners are commonly used for cleaning metal and are designed to remove grease and oils. Dish soaps are examples of mild alkaline cleansers that would well work with Coolube, as would most other alkaline based industrial detergents that may already be available in your shop.