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milk on PCB
milk on PCB
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Old 7th December 2017, 10:04 PM   #1
billshurv is offline billshurv  United Kingdom
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milk on PCB
Default milk on PCB

Any ideas how to remove encrusted milk off small SMD components? My darling 17 year old managed to pour a glass onto her laptop which oozed through the keyboard onto the motherboard. Hit around the power management circuits. So by the time I got hold of it had set into nice furry deposits on tiny SMD components. I don't have a dishwasher which I know is the usual in this case and my handy spray can of flux remover isn't even making a dent so wondering what is next up the chart I can try? I know I have less than a 50% change of getting this thing back to life but have to try
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Old 7th December 2017, 10:16 PM   #2
Ron E is offline Ron E  United States
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my thought - 70% IPA and a cotton swab.
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Old 7th December 2017, 10:22 PM   #3
billshurv is offline billshurv  United Kingdom
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Might work. Need to find a local source. I would use baby wipes but worried on the pull load on the teeny passives. Thank goodness no BGA in the affected area.
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Old 7th December 2017, 10:38 PM   #4
JeffYoung is offline JeffYoung  Ireland
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milk on PCB
IPA Isopropanol ALCOHOL Industrial PureChem 99.9% (1L): Amazon.co.uk: Office Products
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Old 7th December 2017, 10:51 PM   #5
tomchr is offline tomchr  Canada
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You can usually buy isopropyl alcohol (IPA) at the pharmacy. Beware that rubbing alcohol is a low concentration of IPA and is not as useful for cleaning electronics. You'll need the highest concentration you can get.

At an electronics store, you can usually find horse hair brushes intended for flux cleaning. I'd get one of those and a can of flux cleaner.

Clean the PCB with IPA first. Then flux cleaner. Then wash with IPA.

If you don't have a horse hair brush, a toothbrush can work. Just beware that many flux cleaners contain acetone which will very likely dissolve the bristles on the toothbrush and make an even bigger mess.

Tom
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Old 7th December 2017, 10:56 PM   #6
Max Headroom is offline Max Headroom  Australia
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Milk solids are water soluble and not solvent soluble.
brushes.jpg
Use an artists brush like those above (bristles cut square and shorter) and scrub the affected area, quickly dry the brush in cloth or tissue, and then use the brush to draw up the liquid in strips/stripes.
Do this process twice or more to remove all traces of organics/solids.

Repeat the above process with Isopropyl, and then 'cook' with a hair dryer to evaporate all solvent remnants.

Close inspection may reveal solder joints that are already electrolysis/deeply corroded.
Apply liquid flux and resolder these joints and then IPA clean and reinspect closely.

This has been my standard coffee/beer/whiskey/cola/milk/water damage repair method since forever, works for me.

Dan.
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Old 7th December 2017, 11:00 PM   #7
olsond3 is offline olsond3  United States
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I have had success loading distilled water into an espresso maker and blasting a PCB with the steam wand. Cleaning a PCB with alcohol can sometimes just smear certain types of solder flux around on the board and not remove it, spreading slightly conductive gunk everywhere. Board manufacturers usually clean with de-ionized water wash, so emulating that is usually your best bet.
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Old 7th December 2017, 11:22 PM   #8
billshurv is offline billshurv  United Kingdom
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A few good ideas to try, thanks.
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Old 8th December 2017, 05:39 AM   #9
Enzo is offline Enzo  United States
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I have found that warm water flowing on the board removes many things. Even a little bit of dish soap in water. A little soft brush action is a good idea too.

Alcohol absorbs water into itself readily, and in biology labs and such places, they even use it as a drying agent after water washing glassware. And in some places, ether after alcohol.

Isoprop alcohol from the pharmacy usually comes in strong - like 95% - and dilute. I only buy the strong, since I can always dilute it if need be. But either should work here. And they are real cheap. NO need for reagent grade or lab quality stuff, we are just cleaning with it. Very useful around the shop.
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Old 10th December 2017, 07:59 PM   #10
soundbrigade is offline soundbrigade  Sweden
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It is said (at least over here i Valhalla-land) that equal solves equal. Meaning where the solvent is wwater, use water. Is the solvent oil, use oil.
Someone already said water, so use water.
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