Not all dried paint is 100 percent removable. Here are some suggestions. Use a citrus gel solvent spotter formulated for carpet. A gel stays on top of the carpet fibers and slows evaporation allowing the solvent to dissolve the paint. Volatile spotters normally contain tetrachloroethylene or perchloroethylene, suspected carcinogens. Liquid paint removers can quickly penetrate to the carpet backing and loosen or dissolve the adhesives. Both give off fumes that can be hazardous to breathe.
If hardened drops of paint are visible on the tips of cut pile, begin ... — Gary Clipperton, National Pro Clean Corp.