If you follow my instagram, then you probably know about my friend. He is swapping engines in his Audi Coupe. He had a 2-liter petrol engine and he broke it. And he bought another car (after swap) with 1.8 turbo from Audi A4 B6. And basically he is making from those two cars one whole car. When you’re working with your car parts
often you have some oil or other kind of dirt on your engine, on metal parts. So, what he did was baking soda blasting. Basically he made a blast gun with soda. And he used it on his gearbox and engine. Take a look.