I haven't yet tried Retro Clean but I don't deal with vintage quilts often.
I was given a quilt with embroidered blocks that had been sitting around collecting dust and dirt for years. It had brown and yellow stains/discoloration all over the white background.
Best we could tell, it was least 40 years old (this was 10 years ago).
The setting wasn't anything interesting so I took the quilt apart to reset the blocks in a new quilt.
I first soaked them in a plastic tub with BIZ (powder detergent available from the supermarket - very inexpensive).
Just left them in overnight and they came out looking SPECTACULAR.
I couldn't believe the difference.