What with a very oily engine sitting on the bench awaiting clean up,
thought I'd ask - are there any good 'homebrew' recipes for liquid
degreasant?

I used to really like Gunk, but you can't get it on this side of the
Atlantic, and I've not been able to find any brush-on equivalent (the Goop
paste seems to work really well for hands, and I found something-or-other
in a spray can at the store yesterday which I've yet to try, but some
brush-on stuff ala Gunk would be nice)

cheers

Jules