How do I clean set-in stains from a fabric sofa?

you need to check that pin https://www.pinterest.com/pin/372109987940684882/

Here's a good tutorial: https://www.youtube.com/watch?v=keGQVcY6EaM

Hi ! Get Folex carpet cleaner !!!!!! It will get the stain out !!!!

I use a product called Woolite Carpet and Upholstery Cleaner. It has a brush built in the lid. Just spray a small amount on the stain. It will foam up. Then scrub the stain with the built in brush. I have used this on multiple stains and was very happy with results.