Paint Mix for Whitening or a Coverup for Misdeeds

Puzzle 11 of ABBA Easy Pack

Question is: Paint Mix for Whitening or a Coverup for Misdeeds

and the answer is: WHITEWASH

Word Meaning:

WHITEWASH — (uncountable) A mixture of a powdered mineral substance (often slaked lime (containing calcium hydroxide), chalk (calcium carbonate), or both) and water which is used for painting surfaces such as fences and walls bright white.

Definitions from Wiktionary.