Tree resin on yorkstone flags - Best way to remove ?

[Edgecraft]

Hi

I do a fair bit of Pressure washing and re-sealing work and don't have many problems, but recently I've had two jobs with black tree resin spots on yorkstone flags that just won't shift (Chlorine and even a wire brush doesn't mark it) !

I've been tempted to use brick acid or even wet sand blasting it but I don't really want to start removing the yorkstones surface.

Anyone got any ideas ?

Darren

[lutonlagerlout]

roger knows cleaning!
ask him
LLL :;):

[RAPressureWashing]

Hi

I do a fair bit of Pressure washing and re-sealing work and don't have many problems, but recently I've had two jobs with black tree resin spots on yorkstone flags that just won't shift (Chlorine and even a wire brush doesn't mark it) !

I've been tempted to use brick acid or even wet sand blasting it but I don't really want to start removing the yorkstones surface.

Anyone got any ideas ?

Darren

Darren,
What tree is it, I've had sap marks on Indian sandstone, and they were a bugger to shift, the tree was a fir/pine the ones that drop bloody pine cones everywhere.

[dig dug dan]

varnish remover worked for me!

[Edgecraft]

Not sure which trees are the culprits as there are Sycamores, poplars, conifers and others without there leaves on, all in the locations, a real mish mash !

I read on a blog somewhere of someone using Isopropinol but I don't think it's really suited to use in a garden as it tends to kill everthing, and I suspect Varnish remover could have a similar effect on the customers plants, although if it was my own garden I would give it a go.

Darren

[matt h]

acetone should do it but small area test advised:)