This worked amazing well on really bad efflorescence. Had to apply more than once and used a scraper but very happy with the result
Customer service: 5
Ease of use: 5
Effectiveness: 5
Value for money: 5
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Easy to use dried white, then after 2 weeks put sealer on, brought colour back
Customer service: 5
Ease of use: 5
Effectiveness: 5
Quality: 5
Value for money: 5