Found this online…as looking to buy a GDI +4 for my Dad

https://bobistheoilguy.com/forums/threads/any-concern-of-carbon-build-up-focus-2-0-gdi.357106/

https://bobistheoilguy.com/forums/threads/stp-pro-series-intake-valve-cleaner.356006/

Is that the easy solution to carbon build up on the GDI engine…

Its is a high millage engine. In the USA and that is what they do..