White marks on block paving

« **on:** June 10, 2010, 05:44:46 pm »

Hello guys i cleaned a drive recently and part of it was covered in white marks which still remain after cleaning any idea what may be causing this and how to remove it.
The area in pics is under a porch area the rest of the drive is fine came up lovely.

http://i741.photobucket.com/albums/xx54/baldbrummy/Whitemarks2.jpg

http://i741.photobucket.com/albums/xx54/baldbrummy/Whitemarks.jpg

http://i741.photobucket.com/albums/xx54/baldbrummy/WhiteMarks3.jpg

« **Reply #1 on:** June 10, 2010, 07:07:11 pm »

Looks like efflorescence

« **Reply #2 on:** June 10, 2010, 07:39:41 pm »

i have seen this before but not as much as this can it be removed

« **Reply #3 on:** June 11, 2010, 08:08:51 am »

« **Reply #4 on:** June 11, 2010, 10:00:23 pm »

is this common when washing? does this happen after washing or is it sometimes already there on paving

« **Reply #5 on:** June 11, 2010, 11:48:38 pm »

Looks like clay pot plants etc. have been there. These can leave a permanent stain.

« **Reply #6 on:** June 12, 2010, 05:40:08 pm »

Would have to be very big clay pots this covers an area of 3 by 2 mtrs

« **Reply #7 on:** June 12, 2010, 06:32:03 pm »

Looks like efflorescence

« **Reply #8 on:** June 12, 2010, 06:45:52 pm »

Yes definitely efflorescence, i get it a lot when I'm cleaning Terracotta floors.