how can you clean hydrocarbons from your emissions?

Question

clean hydrocarbons from automobile to pass emissions

Answer 1

tune up change plugs find vacuum leaks
high hc is almost always some kinda misfire

Answer 2

Run a couple of bottles of a fuel system cleaner through the car,
not the cheap stuff I use Techron from Chevron, the one from Lucas works good to,and there are a few others, you can also go to a place that does a full system cleaning, they run the car off a botle of cleaner for 5-10 min and that does a good job,it's a little expensive though, about $60.00 also a tune up if it hasn't been done in a while.