chrishawley Posted September 26, 2023 Report Share Posted September 26, 2023 Have used Jenolite for the past 50 years and never felt the need to change. That's untill I nearly had a heart attack at the current price of just short of £100 for 5L. Wot! So thought I'd try milkstone remover(MSR), £20 for 5L: Dilute phosphoric acid by any other name. First go with MSR seemed good (pic 1) based on a two hour soak. But what about a comparison? Pic2 shows, left to right: warm water with Fairy (control), Jenolite, then MSR - all immersed to the depth of the orange line for 60 minuites. Ideally one would run repeat (and possibly blinded) trials but for £20 v £100 I'm, happy with the MSR! 3 Link to comment Share on other sites More sharing options...
ed.h Posted September 27, 2023 Report Share Posted September 27, 2023 Active ingredient in Jenolite Rust Remover is Phosphoric acid. Ed 1 Link to comment Share on other sites More sharing options...
Unkel Kunkel Posted September 27, 2023 Report Share Posted September 27, 2023 Machine Mart also do a rust remover (which is phosphoric acid) It is sold under their Clarke brand name simply as ‘Rust Remover’ I find it indistinguishable to Jenolite. However, there is a big price difference: - £8.39 for a litre bottle compared with Jenolite @ £34.99 ( or 5L is ~£100) at B&Q 2 Link to comment Share on other sites More sharing options...
Iain T Posted September 27, 2023 Report Share Posted September 27, 2023 Thanks for the post. I bought a small bottle of Jenolite to treat a few rust spots and like you gobsmacked at the price which I think was over £20 for 150ml! Iain Link to comment Share on other sites More sharing options...
JohnD Posted September 27, 2023 Report Share Posted September 27, 2023 (edited) Yes, I've long advocated MSR! And well done for your "Which?" style comparison, Chris! Any acid will attack rust, but you need a "Weak" acid so that it won't corrode the original iron. That means, usually, an 'organic' acid, and any will do the job of removing rust, from Acetic (vinegar) to Uric acid. There isn't one that starts with a 'Z'! But phosphoric acid has the unique property of reacting with rust to form an insoluble product, iron phosphate. So you get a layer of the phosphate bonded to the iron (steel) that is a good foundation for primer and paint, when others leave the surface naked and prone to 'flash rust' on exposure to moist air. The only drawback is that once the acid has formed the insoluble layer, it cannot attack any deeper rust, when the others will take it away, right down to the metal. So any heavily rusted piece must be vigourously abraded first to get off as much rust as possible. John PS before someone else points it out, yes, Coke will do the same, as it contains phosphoric acid! It's what give the revolting stuff its 'bite', but that needs less than 1% acid in the drink, so it won 't do much more than make a penny shiny! J. Edited September 27, 2023 by JohnD 1 1 Link to comment Share on other sites More sharing options...
daverclasper Posted September 27, 2023 Report Share Posted September 27, 2023 Also, I have found you can make a liquid into a gel, using wallpaper paste. Cling film over it will prevent it drying too quickly 1 Link to comment Share on other sites More sharing options...
Unkel Kunkel Posted September 27, 2023 Report Share Posted September 27, 2023 Rust is not just oxides of iron, there is also a lot of brass in there, - not in the metallurgical sense, more ‘where there’s muck there’s brass’ Big business is rust. Link to comment Share on other sites More sharing options...
JohnD Posted September 27, 2023 Report Share Posted September 27, 2023 2 hours ago, daverclasper said: Also, I have found you can make a liquid into a gel, using wallpaper paste. Cling film over it will prevent it drying too quickly Mr.Ingenious! You can, of course, dunk your part in the acid. Link to comment Share on other sites More sharing options...
daverclasper Posted September 27, 2023 Report Share Posted September 27, 2023 Of course. Gel useful for areas of body, etc Link to comment Share on other sites More sharing options...
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