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Best process for cleaning granite shop front

DeLaCruz

Active member
Messages
424
Location
Cornwall
Job is to remove the black stains and also some mild green around the top, freshen up the exterior - shops in high street and I need it done by Sunday ? Could be an opening to a bigger contract so wanna get it right, first thought is to just degreaser the mold and scrub + rinse it, the weak hypo the left overs. Could a weak hypo of the whole lot be an option? Obviously awkward given the location of busy high street - haven’t quoted it yet so wanna get an idea of the best method before I put a number on it - any ideas on this kinda material much appreciated- thanks in advance 

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Also some small paint to be removed - more pics below (sry could not add to OP mods as file size exceeded)

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Hypo will remove the algi , but usually stuff like that needs doing with a doff , it’s specialist work really . 

 
What the only the paint need Doff? I think that will be passable without me removing it hopefully but I grab some graffiti remover for that I reckon 

 
What the only the paint need Doff? I think that will be passable without me removing it hopefully but I grab some graffiti remover for that I reckon 
Ime no expert in stone cleaning , but I know most use a doff for  this type of work it will remove all the dirt without causing any damage , but if you just want to kill off the algi and make it look a bit better hypo will do that but it won’t remove any carbonaceous deposits which more than likely will be present on an older building like that, I did some granite pillars on our post office I did it with   hypo , it didn’t touch it , tried the pressure washer again no joy ,Ime sure that it was carbon deposits I gave up in the end ????. 

 
Ime no expert in stone cleaning , but I know most use a doff for  this type of work it will remove all the dirt without causing any damage , but if you just want to kill off the algi and make it look a bit better hypo will do that but it won’t remove any carbonaceous deposits which more than likely will be present on an older building like that, I did some granite pillars on our post office I did it with   hypo , it didn’t touch it , tried the pressure washer again no joy ,Ime sure that it was carbon deposits I gave up in the end ????. 
Are the black stains carbon deposits in your opinion ? Looks like they’re below the cracks where water has been more prevalent, so was going it would be some kind of mold 

 
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Are the black stains carbon deposits in your opinion ? Looks like they’re below the cracks where water has been more prevalent, so was going it would be some kind of mold 
Might be black mould , try a bit of hypo if it comes off it’s mould if not it’s carbon looks like it could be mould ?

Is this in Truro ??it looks familiar ?? 

 
Might be black mould , try a bit of hypo if it comes off it’s mould if not it’s carbon looks like it could be mould ?

Is this in Truro ??it looks familiar ?? 
Thanks mate - no it’s one of Newquay few decently built buildings left scattered amoungst the new build apartments and derelict shitholes

 
Had a result with this job - agreed with vendor to softwash it, went down but wayyy to many civilians around in the street so sacked it off - arranged to do it early next day before high street got busy. Driving home I spot a graffiti removal van with what looked like a large tank and system in the back of the van. Stopped and chatted to the guys and they were really helpful, boss was from London and I explained my situation - ended up taking a look at the shop and he said I could use his rig the next morning while they did some other stuff nearby, brought the boys a crate of beers and got it done in about 45mins - pics below: 

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