paint splatters sown the side of the car is quite a common thing! 
whilst rr is correct in saying cutting compound there are a few other things to try! 
painstakingly long as it will take you can sit there and chip it of with your finger nails for one, you could use panel wipe / thinners to remove them, tar and glue remover will ofter remove them too as will fall out remover! if your feeling brave then you could use a clay bar to remove them along witht he fall out remover (which is what it was designed to do but with industrial fall out from the roads more often used on commercial vehicles and High milage motorway cars! hwich is why a lot of the coaches you see are painted a beigy colour to hide it!!) 
Cutting compopunds come in various compounds much like wet and dry paper! coarse, medium corse, medium, fine and ultra fine! Your best bet would be an all rounder like Farecla G3, widely available through most motor factors and fair priced! usefull point though, with cutting compounds you dont need to use mauch of the compound at all! tiny pea sized blob on a damp cloth or polishing sponge and spray the panel with a water spray from a trigger bottle, most of the paint splatters will come off easily! 
when your done with what ever you choose then make sure you get a coat or two of polish on the area you have been working on!  (wax works as a sealant so no point in applying it over the top of a panel unless its been prepped propperly!)
t-cut is quite a harsh version of a compound and although widely recognised isnt as good as it should be! more often leaving more marks on the inflicted panels that started out with! 
if your in the cornwall area then give me a shout as i have all the gear including machine polisher and would happily have a crack at it for you! Its been my trade for the past 11 years! (sharons husband here btw!!)