White marks on brick drive

I have a brick drive and there are roundish white marks on it, if I power wash it, that will remove them, but as the saying goes, they'll soon be back.

Is there any thing I could put on them to stop them coming back

Old-n

 

You might find the answer here http://www.pavingexpert.com/stains.htm

 

Or try 'wet and forget' or similar - this prevents fungal and other regrowth.

 

I have the same markings on my drive . Pretty sure its lichen . As Shiney said a cheap Asda bleach solution , then jet wash an hour later should do it . It's on the list off to-do jobs for me , but a long way down the list at the moment .
A really good report on Lichen removal on Pavingexpert , worth a read..
http://www.pavingexpert.com/maintain_03.htm

 

Shiney , I have booked you in . You are job number 3,784 . Completion date 8th December 2042. You will receive an email when I am 30 minutes away , please ensure your drive is clear on the day

 

Thanks chaps for getting back to me

I have use bleach solution it does not touch it plus giving a good brushing about an hour after, earlier in the year I have sprayed with Solium Chorate to kill the weeds that grow between the bricks, some must have got on the white mark but it are still there. I have not tried vinegar I might try a little in one of the corners.

Here is a close up of one brick.

 

When it stop rainning

 

@Old-n , let us know how you get on. The forecast is for it to stop raining mid March !

 

Hi Harry

I did not think there was any point until at least 2 days no rain as it would wash the vinegar away

Old-n

 

I managed two days without rain, the vinegar did nothing to kill the growth ?