Deposit Left Behind by Hard Water

This page is the CodyCross answer for the clue below from Trip to Spain, Group 858, Puzzle 4 (Exciting Nightlife).

Question is: Deposit Left Behind by Hard Water

and the answer is: LIMESCALE

Word Meaning:

LIMESCALE — A white, chalky deposit of calcium carbonate found in kettles, washing machines etc., especially in a hard water area.

Definitions from Wiktionary.