If the overspray is on good paint use Mineral Spirits, or the reducer your painter used to mix your paint. Be CAREFULL ! don't rub too hard, or let it soak in, use a clean rag, and wipe in one direction, it helps if your paint has had time to cure, after the overspray is gone, polsih or buff as normal.
If the overspray is on the under coating or metal parts, you don't need to be as carefull with the reducer, wipe down, and use a little elbo grease.
regards Mark
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