Simple. Pre soak fabric in hot water. Add some dish soap and vinegar with your dye and water mixture. Get it all to a simmer and test dye a portion of the material. Stir the items as they soak in the dye mix. Be ready to pull it and immediately rinse in cold water as soon as you get the color you want. Easy.
Used the dye to dye our 14'x10' screened in porch rug. Used 32oz dye to 8 gallons of water and applied
it with a garden sprayer. Our light tan rug is now a beautiful apple green. 100% pleased with the results.