How to clean Bath stone?

[Maggie1]

Hi

I have a Bath stone wall which is covered in lichen etc.
Can anyone suggest what is the best way to clean this as it is very soft and I don't want to damage it by using the wrong product.
Thanks in advance for any advice

 

[r896neo]

I would use a bleach solution. 90% of the biocide stone cleaners contain acid which is always a slight risk.

Follow the receipe at the bottom of this page

http://www.pavingexpert.com/stains.htm

 

[Maggie1]

Thanks

 

[chorlton2080]

I would be interested in seeing a before and after picture if you use this method as I'm also similarly nervous about what products to use.

 

[Maggie1]

I ended up just using the Karcher on it. It has cleaned a lot of it off and looks much better but not sure if I will go on to use anything else on it or leave it a it is.