That's good advice there Gadge.
Now all I wanted to do is get half a tank of fuel out of a Subaru Liberty Wagon yesterday that we sent to scrap and it was impossible to get to with all the bends in the inlet filler, as such it would've been around $50 worth of fuel good for parts cleaning as you've suggested as that's what I generally use if it's just a quick and small job to do.
A mixture of Petrol and Diesel is absolute poison to diesel powered vehicles but great as parts cleaning fluid as you suggested.
Wish you were just down the road Norm as I would've quickly solved your problem.
Cheers,
BB.