My vehicle is a Kia Rio 5 lx 1.6 L with direct injection engine. I sprayed the intake valve cleaner into the 3/8 inch PCV vacuum hose. I disconnected the hose from the PCV valve on the valve cover and sprayed the entire can into the open end of the PCV hose leading to the intake manifold. Was this OK to do? It did work great but someone told me it was a very bad idea. The reason I bought Sea Foam Spray was to clean the intake valves.