I like to use the Tide cold water detergent and wash my stuff on cold since the clothes stay nicer. I noticed they started making Tide Free cold water and I'd like to use that for baby stuff to prevent shrinking and keep it in nicer condition, but I'm wondering if cold water won't clean spit up, poop etc. well enough. Any thoughts/experience on this from seasoned moms?

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Re: Cold water for washing baby clothes?
If you're worried about stains, there is an OxyClean baby version...the stuff is AMAZING!!!
Here's what I know about laundry and stains.
Heat makes stains set. So, if you're ever concerned about a stain, air dry the garment after washing. At the very least, make sure you check the garment before throwing it in the dryer to see if the stain came out.
My sister in law SWEARS by Dreft stain spray. She says it's the only thing that ever got spit up out of clothes.
As far as water temp. I was always told that for really bad stains, to again, use cold water to avoid the stain setting. Once it comes out, go ahead and wash again in warm/hot water if it makes you feel better about the garment's clean-ness.
And also, Pre-treat stains when possible.
Actually, as learned from my cloth diapering journey, for poop soaked clothes, I would definitely start with a cold wash. Take it out and look at it and don't dry it if the stain didn't come out. If it didn't come out, I would wash that item again in warm water.
Oxyclean powder as well as Oxyclean spray are pretty good. But sometimes it's helpful to dissolve the powder in warm/hot water and add it to the wash b/c it doesn't dissolve as easily in cold water.
For cloth diapering, you always start with a cold wash or rinse to get all the poo out without setting the stain, and THEN do a hot wash to really clean and sanitize.
Ditto on the OxyClean baby! It's awesome and we wash everything in cold water. It got two year old spit up stains out of my nephew's hand-me-downs.