Waste of money. I watched my shop do the walnut blasting and that still required some manual scraping. The fluid will do nothing. Going rate for walnut blasting is $350 including new intake manifold gaskets.
2007 SGM E90 335i
JB4 G4, Mr.5 Intake, VRSF 7" FMIC, ER Sport Oil Cooler, M3 Rep Bumper, RB PCV Valve, Cyba Scoops and Quad Tips, 17x9 ET30 and 17x9.5 ET35 Concave Apex Arc 8, M3 UCA/LCA