Try immediately to wash the thing. Can increase hot water to 40-60 degrees, the thing can wrinkle, but should wash out. This method of removal of undesired paint from clothing valid only in the case that thing shed from another.
Colored things soak in stain remover. Stain should be marked "Color". Dilute it in water in accordance with the instructions in the manual. Soak the thing for 30 minutes, then wash it as usual.

For whites, use bleach labeled "Wait". The white stuff can be left soaked for 2-4 hours. After that they are very easy to clean.
Colored things soak in hot water with ammonia. Proportion: 2 bottles of alcohol in 5 liters of water. After 1 hour wash it.

For whites, alcohol and ammonia water, add 100 gr. hydrogen peroxide.
If all your attempts to wash the thing was not successful – contact the dry cleaning. You may be able to help wash out faded thing.