The 500ml can of Holts EGR cleaner was plenty for doing the valves. I also used some for cleaning the throttle body and the manifold, spraying into all the holes and swooshing it around several times - to get rid of any residual oil lurking on the internal surfaces. There's still a small amount of cleaner left in the can. It was considerably cheaper than some of the seemingly similar products such as Seafoam or CRC. It smells a bit like cellulose thinners and I was careful to avoid getting it on my hands.
For the S1 Roadster ford do not recommend cleaning the throttle body with such a spray as it can strip off the plastic coating on the body. It will be Iso propyl alcohol probably which is one of the thinners for nitro cellulose based inks & paints.
JohnV6 2022 CX Plus Four 2025 MG ZS EV aka Trigger
