go buy a can of spray gunk degreaser or hyper clean degreaser,,,,about £3 or £4 depending where you get it,,,and a can of wd40 or gt85
drive to a jet wash if you havnt got one
spray the degreaser everywhere,,,use a few different brushes,alloy wheel brush,paint brush etc etc to have a good,,,,,,brush,,,lol
stick a quid in the jet wash and give it a good,,,,jet wash,,,lol
take it for a spin then spray wd40 or gt85 everywhere,,,,,,,,,bam,,,,,,,engine looks new
as a dealership valeter we use to spray tfr all over the bay,,,jet wash,,,then tyre shine everywhere getting good results,,,,,orders from the boss though,lol