stain removal blocks & granite
Ok, I have just been down to the local cemetary who wants a quote on cleaning down their memorial walls ( where the departeds ashes are stored) which are over 20 years old and have been stained through years of neglect and dam water spray. The stains I can see range from hard water rust staining, moss, pollution (hwy very close) and mold. I have some photos and will put them up later today. The walls are majority concrete masonary blocks and granite. They have a memorial plaque on them made out of brass and have grass & plants all around, hence my delema.
How does one clean such a monster? I had originally thought of bleach/ chlorine to start with, but they will kill the grass around them, then I thought of oxalic acid on the concrete walls but am unsure as to what this will do to the brass plaques!
If I just use hot water on medium pressure it will not move the ingrained stains, just the moss etc.
There is a country mile of these walls to do and would be a fantastic job to complete as I am also trying to get in on the maintenance of the walkways etc throughout the entire cemetary.
I am looking at doing a test patch for them mid/late next week to get an idea of what results I can achieve(if any!!)
Any input would be greatly appreciated, pls keep in mind I am in Australia and we unfortunately don't have access to a lot of the premix chems that you all do.( we are years behind) I have looked through past posts but nothing seems to be what I need
Brett
Ok, I have just been down to the local cemetary who wants a quote on cleaning down their memorial walls ( where the departeds ashes are stored) which are over 20 years old and have been stained through years of neglect and dam water spray. The stains I can see range from hard water rust staining, moss, pollution (hwy very close) and mold. I have some photos and will put them up later today. The walls are majority concrete masonary blocks and granite. They have a memorial plaque on them made out of brass and have grass & plants all around, hence my delema.
How does one clean such a monster? I had originally thought of bleach/ chlorine to start with, but they will kill the grass around them, then I thought of oxalic acid on the concrete walls but am unsure as to what this will do to the brass plaques!
If I just use hot water on medium pressure it will not move the ingrained stains, just the moss etc.
There is a country mile of these walls to do and would be a fantastic job to complete as I am also trying to get in on the maintenance of the walkways etc throughout the entire cemetary.
I am looking at doing a test patch for them mid/late next week to get an idea of what results I can achieve(if any!!)
Any input would be greatly appreciated, pls keep in mind I am in Australia and we unfortunately don't have access to a lot of the premix chems that you all do.( we are years behind) I have looked through past posts but nothing seems to be what I need
Brett
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). They'll look like new, but I doubt that's the look they were originally meant to have.