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Using Harpic 10x (Hydrochloric acid based) to clean downpipes...
#1
(I've posted this in a few places on Facebook as well, so sorry if some people see this more than once.)

Ok, I've been recommending that people *don't* use Harpic to clean their downpipes because it is not good for stainless steel. (See https://www.bssa.org.uk/topics.php?article=30 for example)


But, since I've got an old FZ6 engine in my shed (replaced after the big end failed) and it's got rusty pipes, I've decided I'm going to put my money where my mouth is and see what actually happens.


So the idea is to clean Pipe 1 with Autosol, Pipe 2 with Harpic and leave it on. Pipe 3 with Harpic and wash it off with distilled water and possibly leave Pipe 4 as it is. Then I'll spray them all with a salt water solution (to represent riding on roads in the winter) and leave them for a while to see what happens.


ADDENDUM: To clarify, based on a couple of comments I've received, the idea is to see if they are *more likely* to corrode after the Harpic treatment than with eg Autosol.


Does anyone have any (helpful!) comments on my scientific method? Anything else/ better I could try on Pipe 4 instead of leaving it as a control?


Useful suggestions would be welcomed.
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Using Harpic 10x (Hydrochloric acid based) to clean downpipes... - by Grahamm - 08-04-20, 06:43 PM

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