Cleaning residential stove hoods
You might want to do it yourself.
I clean my Venta Hood with a degreaser from Home Depot.
It's Zep Citrus Degreaser in a gallon container.
If you use it straight--depending on how bad it is--you'll need to rinse a lot, but it is so fast and
I've also clean a huge (huge) commercial hood with same with quick results.