I take a lot of advice from the WWW with caution especially because you just don't know who is to be trusted and who is not.
With this in mind I was looking for a solution to remove the few paint splotches that ended up on our carpet. Having used a water based paint I thought that it would be an easy fix but the paint had already dried and was being very stubborn.
A quick search of the web and I found numerous solutions and cautiously picked the one that would not impact on my carpet in any undesirable way. So I was pleasantly surprised when my painted started lifting with relative ease.
So here is the recipe.
Recipe for Removing Dry Water Based Paint.(as found here)
some very hot water, not too much as it goes cold quickly
a small squish of dish washing liquid.
A soft cloth
That's all there is to it. Put a small amount of the mixture onto the paint. Give it a few moments to warm the paint up and then you will find it will lift very easily.
You have to trust me the paint on the carpet was just right of the container.