cold water will help -set the color- so ....
you probably wont get them out. depending on the quilt of course maybe you could use a stain removeing product like shout? but warm water is going to probably be needed...use cold water when you don't want your marks to disappear...sometimes some agitation is necessary too...can the quilt be washed in a washer?...with warm water and some detergent?
also, if you heat set the marks (pressing) it will be more difficult