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Posted: Sat Mar 15, 2008 10:09 pm
by 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
Posted: Sun Mar 16, 2008 12:33 am
by lutonlagerlout
roger knows cleaning!
ask him
LLL :;):
Posted: Sun Mar 16, 2008 8:40 am
by RAPressureWashing
Edgecraft wrote: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.
Posted: Sun Mar 16, 2008 10:18 am
by dig dug dan
varnish remover worked for me!
Posted: Sun Mar 16, 2008 12:42 pm
by 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
Posted: Mon Mar 17, 2008 11:07 am
by matt h
acetone should do it but small area test advised:)