Send your pics to Lyn at EacoChem - they can look and tell you. Doesn't look like efflo - more like white scum.
I know this post is old, but I wanted to thank everyone for the help. 600 knocked it out. The trick was to dillute it heavily before applying. I called a brick guy for help on this and now we trade a lot of work back and forth!
I know this post is old, but I wanted to thank everyone for the help. 600 knocked it out. The trick was to dillute it heavily before applying. I called a brick guy for help on this and now we trade a lot of work back and forth!
If it dissapears when wet it's effloresence. If not, it's most likely lime run. Contact Prosoco for some Sure Kleen 600 or Custom Masonry cleaner. That should remove it.