Set within stains? do you use hot or cold water to get stains out? someone...

do you use hot or cold water to get stains out? someone tole me that ether hot or cold will set it contained by deeper but i can't remember which.

I'm cleaning my husbands acu's(army uniform)

and I'm just confused...hot or cold water?
Answers:    Use cold marine, and not the dryer. I use Simple Green to remove most stains. Good luck!
OxyClean works well also for removing stains. I've even been competent to remove older set in stains beside this product. cold water. and dont put the stain in the drier. that will get it permanant.