If you go with a popular acid-based cleaning method, follow these key steps.
1. Prep the affected area and surrounding space carefully.
2. Test the target area first. Apply the solution in a small, unobtrusive patch with a sponge or spray bottle. Scrub it in with a brush then rinse off lightly.
3. Don’t overuse water when you’re rinsing the solution. Remember moisture is what led to the problem in the first place.
4. Wait till the area is 100% dry before seeing if the cleaner worked. You might need to apply the product a couple of times to get rid of all the white rot.
5. Seal the surface to lessen the chance of efflorescence returning.
You’ll find YouTube videos like this example from Australia’s National Masonry firm that walk DIYers through the cleaning process. However, Core4 recommends working with professionals who know:
· The best methods, products and equipment to use.
· How to test areas properly.
· How to diagnose tricky cases where efflorescence keeps recurring.
If efflorescence is a repeat offender, you will need to do some detective work to figure out what kind of moisture issue is making it come back. At this point, enlisting a specialist will definitely save you a lot of time, money and hassle.