i took my intake manifold off and was wondering what is the best ways to clean the pipes ive used that stuff where you spray in and rev your engine but as im looking down the pipes right now there is just like a layer of grit in all four of them mainly becuase the engine sat for a long time

 

soak it in a bucket full of solvent, gas, carb cleaner or paint thinner..... .after it has soaked overnight.... . . get a tooth brush and finish it off..

 

sounds good