I have used straight Kero to clean engine parts, smells better than diesel.
I might drain the oil, clean filters, pull the plugs, put in 2 quarts of your chosen cleaner, kick over till my leg gets tired.
Let soak for a bit. Drain the cleaner out. Check filters.
Repeat till the cleaner comes out clean.
If your engine has been properly stored I wouldn't worry about it much.
A lot of bikes that have sat for many years have come back to life with no issues. Just change the oil several time at 50 or 100 mile intervals for the first 500 or so.
Leo