I read somewhere about some guys that are doing Soda Blasting engine cleaning. The guys insists about bringing back lost horsepower which in some cases is 20-30 PS and also they are posting images from intake before and after. The car owners after the cleaning claim for huge different and elimination of problems that they had before.
This picture is from Polo 1.4 tsi before and after


What is your opinion about this? Does anyone did something similar ?
