The acid in rain will eventually dissipate a case of mild to medium efflorescence over time. Depending on climatic conditions, this can take anywhere from a couple months to a year. In cases of heavy efflorescence, or if the client cannot wait, the following remedy will work for an extra fee:
• Wait for 2 weeks of dry weather to ensure the stone is dried out. This could be longer in the Winter.
• Apply 2 coats of siloxane sealer.
• Wait another dry week.
• Wash down with Vanatrol, or any light acid masonry cleaner, per the manufacturer’s recommendations.
• Do not powerwash!!!