Efflorescence. Wet the surface, then apply a product like SureKleen 600 per directions. Some slight agitation will speed the process, but as soon as the acid (SureKleen) is applied, you will see the efflorescence begin to bubble off.
I've never tried to downstream SureKleen - I think it would dilute it way too much. As I recall 3:1 water/600. I keep a spray bottle in the van for small areas.
I've never tried to downstream SureKleen - I think it would dilute it way too much. As I recall 3:1 water/600. I keep a spray bottle in the van for small areas.
John is correct. The Sure Klean products work well. We carry them though I would also try our Pro BRC as it can be less costly. I would pre-wet if that surface is pouros brick. That allows the water to be drawn into the pores and not the cleaner. This keeps the cleaner closer to the surface where it is wanted to work, and also makes rinsing easier.
I have had a customer that sent me pictures once where the white residue looked just like efflorecence, but an acid cleaner would not move it. Turned out to be a form of white mold. A good bleach-based house wash did the trick. Just mentioning as sometimes we think it's one thing, and it turns out different. That's rare, but can occur.
No......it's a much stronger hydrochloric - used mainly in cleaning bricks.
Another more affordable option would be EaCoChem's products - less aggressive and less expensive than SureKlean. You also have to be careful what type masonry surface you use SureKlean on.