Blot up wet paint
Using a paper towel, blot up any wet paint from the carpet. Even if the stain appears dry, try blotting it. However, do not rub the paint and avoid applying too much pressure, it may cause the paint to further seep into the carpet.
Scrape off dry paint
Using a butter knife, scratch paint as much as possible.
Apply an acrylic paint remover
Apply an acrylic paint remover on the stain. The remover will soften the dried paint, again scrape the paint off the carpet with a plastic spatula or a butter knife.
After having removed all of the paint from the carpet, it’s time to treat the stain that has been left behind. There are various chemicals and household items you can use to remove the acrylic paint stain from the carpet, and glycerin is one of them. Apply some glycerin on a dry paper towel and use it to blot the paint spill. The paint will be lifted off the carpet and onto the towel. Keep blotting the carpet until all of the paint comes off.
Nail polish remover
You can also use nail polish remover or a paint thinner to remove dried acrylic paint stains. Apply a small amount of either chemical and then blot it up using a soft cleaning rag or paper towel.
You can also use WD-40 to remove dried paint spills. WD-40 is a widely available chemical used to soften hard oily stains. Apply a generous amount of WD-40 to your carpet and work it in with the help of a cleaning rag. Let the chemical sit for 15 to 20 minutes and then scrub the stain area with a hard-bristle brush.
Wash the previously stained area with soapy solution
Follow up each of the above stain removing technique by cleaning the area with mild dish-washing detergent and water and then rinsing the area with clear water.