Removing lichen

[Tony McC]

I was shocked. last summer, when I washed off some pieces of slate I wanted to photograph. Using nothing more than the teeniest of squirts of Fairy Liquid in cold water, just enough to create a lather, it completely killed off the grass on the lawn.

Luckily, with it being such a bonzer summer, it recovered before the landlord had a chance to spot the dead-grass outlines of rectangles all across the back garden, but such devastation from so little detergent surprised me.

[r896neo]

I would guess it t was most likely scorch rather than killed by the chemical nature. As fairy will work as a wetting agent it retain any moisture on the grass surface and then the sun will burn it.

[Tony McC]

Oooh, well thought out! Of course it would have been scorch - I just assumed it was poisoning

[RAPressureWashing]

Scorch or burn is the right words to use really, grass is usually tuff so will grow back, but care is needed, without reading a MSDS for Fairy, it most probably has a bit of Sodium Hydroxide in it so that will damage grass, plus the wetting effect, if you have to work along side grass, pre-wet it so that the grass won't take on the first bit of water/fluid it gets, being the cleaning solution.