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Agree, you need a good brush to work on those tight spaces. Dremel works best on those grout.

HCl softened the mineral deposits took me less time to scrape. I also tried lye or sosa-those powder being retailed at aircon shops. It works too, medyo delikado lang parang malulusaw ang water jug sa init. You need to wait for the chemical to react if you dont wanna brush much.