Yep peroxide is a nursing tip. It eats the proteins in blood. Don't wet or soak first-use the peroxide first.

Sorry to hear about your "spit up". My iron has done that to me so I quit putting water in it. I also use a spray bottle or spray starch.

The last steam iron I threw out, rusted from the inside and spit tiny rusted metal pieces all over my quilt top. I don't put water in my irons anymore, tap water here in Texas has a lot of lime in it.

I, too, no longer put water in my iron.

For the spots, try a paste of dishwasher powder and water or use the liquid/gel stuff that is out now. I have used it for everything from rust stains to ink on DH's best shirts and it works for me.