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Black metal guttering with white build up

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DeLaCruz

Well-known member
Messages
424
Location
Cornwall
Something on a clean I have to do I haven’t seen before looks like a heavy white stain on the black metal guttering - gonna be using the usual virosol mix but wondered if others had seen this kinda staining ? When I glanced okay it my gut feeling was this could be a substance that degreaser won’t work on 

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Something on a clean I have to do I haven’t seen before looks like a heavy white stain on the black metal guttering - gonna be using the usual virosol mix but wondered if others had seen this kinda staining ? When I glanced okay it my gut feeling was this could be a substance that degreaser won’t work on 

View attachment 24248

View attachment 24249
Would that be salt deposits or Galvanic corrosion from dissimilar metals for example cast iron gutter and galvanised nuts and bolts if so you may struggle to clear the staining 

 
Would that be salt deposits or Galvanic corrosion from dissimilar metals for example cast iron gutter and galvanised nuts and bolts if so you may struggle to clear the staining 
Doesn’t feel like it would be salt as I clean plenty of black plastic gutter nearby with no salt deposits - gut tells me it’s something to do with the metals reaction to the surrounding environment 

 
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