Wash it off with a pressure washer , use carrier bags and tape over the fuse covers ect, no problems whatsoever.
Don't have any before pictures, didn't think the Cif stuff would work so well, so you'll have to imagine plenty of dried-on brown crud above the dipstick area. Do have an after picture, so feast your eyes on this.....Do you have any before and after pictures?
P. S. Previous owner of my car was from Pwllheli
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Out of interest, how far is that from where you live?
Seen this in the flesh. It looks stonking for a car done 90k.Auto glym engine cleaners good, spray it on ,make a brew wash it offView attachment 55373