Black smudges on patio! - Black smudges on patio!

[apples]

I am hoping someone out there can help me! I recently jetwashed my patio as I do at least 4 times a year (slightly obsessed i know) and this time black spots and smudges appeared! These would not come off with the jet washer!! My patio looks as if a printer ink cartridge has exploded! Does anyone have any ideas on how i can remove these marks. The patio is only 2 years old.

[London Stone Paving]

Apples

Could you post some photos on the site for us to take a look at?

Use an image hosting website like photobucket to post them. If you cant work it out then PM me and I will post them for you

Steve

[London Stone Paving]

Images posted on behalf of Rachel. Where is Roger ?

[apples]

Roger where are you, I understand you are the expert!

[lutonlagerlout]

looks like algae or lichen which jet washing alone will not shift
roger knows the answer to this
LLL

[Tony McC]

Lichen - see DealingWith Lichens



Edited By Tony McC on 1345551844

[RAPressureWashing]

Looks like Lichen from the photos, on the stains page main site
http://www.pavingexpert.com/stains.htm
There is a mix "Berries & Fruit" this will rid the paving of the black Lichen and clean the paving up no end.