09-04-20, 04:56 PM
(08-04-20, 11:36 PM)mtread link Wrote: Isn't autosol a polish, as well as a cleaner? So it will leave a protective barrier, which of course harpic won't? So not really a fair comparison?
If you search for "how do I clean my downpipes", generally Autosol and Harpic are the two answers you get.
But the aim is to see which one is less resistent to corrosion after treatment.
Quote:So looks like you need a 5th pipe - Harpic + Autosol :lol
I'm thinking that, rather than leaving Pipe 4 as a control, I might do Harpic + Autosol.