If it is still wet, Get a pressure washer and try to spray it down. Or wait till it sets and remove the tiles in question. You would have to get several gallons of mineral spirits to wipe it off by hand.but I do not think it would get it all up. sounds like a mess. good luck.
If the paint was an exterior grade latex, you may be able to use a commercial grade power washer. If you were planning on painting the shingles, you might just want to find a really good exterior grade primer. A paint sprayer from an equipment rental place made a world of difference when I helped my brother paint the exterior shingles on his place