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-   -   Washing dishes with COLD water? (http://www.discusscooking.com/forums/f129/washing-dishes-with-cold-water-45372.html)

Callisto in NC 04-20-2008 12:47 PM

Washing dishes with COLD water?
I have a friend that recently told me that she washes her dishes by hand with cold water because her dishwashing soap has bleach alternative added and she's sure that's enough to kill all the ickies on her dishes. I just can't believe this is safe. It even says it's not a bleach, it's an alternative additive.

What do you guys think? I could never eat off a utensils that weren't cleaned in super hot water. It grosses me out, but maybe I'm just paranoid.

Barb L. 04-20-2008 12:50 PM

I am with you on this one Callisto, gotta be hot for me too !!

GB 04-20-2008 12:52 PM

I do not know for sure, but my thoughts are that the hot water in your sink is not hot enough to kill anything. I use hot just because I find it more efficient at loosening up stuck on stuff and dissolving soap. I would not think that cold water would do a worse job than hot. I just think it would take a little longer to get to the same result.

JillBurgh 04-20-2008 12:54 PM

I don't know about the specifics of what temp is right with which detergent, but I do know from food handling safety classes that dishwasher water should be no lower than 130 degrees F. Better safe than sorry, I'd say.

Off-topic PS: My BF brushes his teeth with VERY hot water and I think that's strange

Andy M. 04-20-2008 01:00 PM

I agree, the water coming out of your faucet is not hot enough to do any sanitizing.

kitchenelf 04-20-2008 01:09 PM

Cold water versus the very hottest water out of your tap are basically the same, as others have said. It IS the detergent that cleans. If something is stuck on though the hot water will help loosen it - that too has already been said - the same for greasy things.

I question whether the bleach would still have to be the correct ratio (can't remember now what it is - 1/100? Don't remember, sorry. Bleach in the dish washing detergent can't hurt, but, I don't know if it's enough to do "the job".

It is surprising though how many germs are killed by plain soap and water.

mcnerd 04-20-2008 01:18 PM

Those that do any canning knows that boiling water (212 F) is needed to kill most bacteria and today's dishwashers supposedly are designed to heat up the water to sufficient temperatures to sanitize. Without a dishwasher, my mother and grandmother used to pour boiling water over the cleaned and rinsed dishes sitting on the rack. I even have a vague memory of my great grandmother with a large boiling pot on the stove that she dipped her dishes in.

The newer dish soups have anti-bacterial agents in them and I wonder how successful they are during normal sponge washing or soaking in the sink.

Jeekinz 04-20-2008 01:21 PM


Originally Posted by JillBurgh (Post 590551)
Off-topic PS: My BF brushes his teeth with VERY hot water and I think that's strange

He could have a sensitive grill. When you warm up your toothbrush it softens the bristles.

As far as the dishwater, hot for me. I don't like cold hands.

love2"Q" 04-20-2008 01:35 PM

most dishwashers if they have a hot water booster will
only reach 140 degrees ..
most people set their water heaters to 125-130 degrees ..
so i do not see how it would matter if you washed in hot or
cold .. i am sure it helps with the cleaning process ..
but i doubt you are killing anything ..

Andy M. 04-20-2008 01:42 PM

i have a Kenmore washer that heats the water to 160F in the normal wash cycle. There is also a high temp cyle that takes the water to 190F. The difference is significant.

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