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06-07-20, 06:53 AM | #11 |
Senior Member
Classic Audi Club Member
Join Date: Apr 2018
Location: Wales
Posts: 1,158
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Try just the baking soda and boiling water. The critic acid will erode the metal if left too long. But it will also eat the rust. Just don't leave it in too long if you decide to try that
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06-07-20, 01:50 PM | #12 |
Senior Member
Classic Audi Club Member
Join Date: Feb 2019
Location: Near an MB ur Quattro
Posts: 1,171
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i wouldn't worry too much-unless all your cooling system is new (i haven't checked!) then you will find a limited amount of crud in every system...
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06-07-20, 06:09 PM | #13 |
Grown up member
Join Date: Jun 2015
Location: South Cheshire
Posts: 212
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I don't know the part - is it particularly thin metal, or something other than steel? I use citric acid to remove rust from stuff (small things that the electrolytic tank is a bit overkill for), and I've left things soaking for days on end before now without any damage.
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07-07-20, 09:52 AM | #14 | |
Grown up member
Classic Audi Club Member
Join Date: Dec 2010
Location: Bingley
Posts: 634
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Quote:
Best to keep a daily check on the parts and remove them when the rust is gone rather than risk the concreting effect. |
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07-07-20, 10:09 AM | #15 | |
Grown up member
Join Date: Jun 2015
Location: South Cheshire
Posts: 212
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Quote:
Interesting on the reservoir cleaning at least, I have a few dirty ones from various cars that would benefit. |
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07-07-20, 07:17 PM | #16 | |
Grown up member
Classic Audi Club Member
Join Date: Dec 2010
Location: Bingley
Posts: 634
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Quote:
The concrete stuff is strange as it also forms on the base of the plastic vessel I use as my soak tank. Once its starts to concrete I usually clean out the tank and start with a new solution the citric stuff is (it was but I've not checked recently ?) cheap enough in 25kg bags. I do prefer to use the citric acid rather than electrolysis just my own preference, brings up brake cailpers a treat, even ones that look like they've been sat in the wreck of the Titanic for years. |
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11-07-20, 02:11 PM | #17 |
Senior Member
Classic Audi Club Member
Join Date: Apr 2008
Posts: 1,326
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Just tried baking soda with white vinegar. It worked a treat! Not perfectly clean but much better than before.
I underestimated the ferocity of the resulting effervescence so my garage ceiling is a bit cleaner now too. Thanks for all your input chaps! |
10-11-20, 04:15 PM | #18 |
Ex Member
Classic Audi Club Member
Join Date: Dec 2007
Posts: 5,565
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Im going to suggest a dip in an ultrasonic bath to get the grime off.
Not me! The reservoir! I bought a cheap one from ebay and it completely cleared out all that brown gunge from a toyota turbo oil cooler that was clogged full of rust, (bit like the vw ones). Just drop in a mix of water and truckwash, turn the heater on and let it rip for a while. Bit trial and error but will remove probably every bit of it. Try it! |
10-11-20, 09:53 PM | #19 |
Senior Member
Join Date: Jul 2007
Location: Five Cylinder heaven
Posts: 1,493
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Isn't this 'crud' the result of two types of antifreeze mixed together?
They react and turn into sludge and can block your heater matrix and rad , worst case scenario. ? |
10-11-20, 10:01 PM | #20 |
Aero Advocate
Classic Audi Club Member
Join Date: Aug 2014
Location: Lancashire
Posts: 1,448
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That, or rust from the iron block due to incorrect coolant concentration or not changing it often enough. (Or all of the above)
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