First things first, "Whitewash" and "Limewash" are different things - especially when it comes to removing them.

Limewash

"Whitewash" is water-soluble and much easier to remove than "Limewash".

"Virtually any coating can be removed from virtually any surface....
Notable exceptions are "Limewash" and cement based paints (e.g."Snowcem"). Lime wash (not to be confused with whitewash) is, once cured, a thin layer of limestone. Like cement mortars, it can be very slowly dissolved with an acidic cleaner but the process is extremely time-consuming, as the product has to be continually re-applied.
Removal is therefore only practicable if...

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