Textile / needlework art cleaners?

Could someone please recommend a place to clean vintage needlework, or point me toward someone who can? I have some 40-year-old crewel work (yarn art) with large yellow stains, and it can’t be displayed in its current state.

I’ve Googled (unsuccessfully) but would prefer a personal recommendation from one of my fellow Houstonians. The items have sentimental value and DIY could potentially become “destroy it yourself”. I’d like to avoid that.