Thank you for the complement T.S...

There's nothing it too it really, all I do is once a month open the bonnet/hood and use a power wash to get rid of the dust and grim before it has a chance to en-grain it's self...

If you use a power wash on a Petrol/Gas engine then I would suggest you leave the engine running and try to stay away from thing's like Spark plug leads/Distributor cap and any other major electrical component, might also help if you carry some kitchen roll and some WD40 just in-case you need to dry off your electrics...

If you do have engrained oil or dirt then Gunk has to be the dog's in removing it, or if you can't get hold of Gunk then Auto Glym engine cleaner or even their wheel cleaner will do, failing them any decent engine cleaning product (I always say each to their own as everyone has his or her own favourite cleaner) and follow the direction's supplied with the product...

Other than that, say once a week just wipe around with a soft damp cloth and then dry cloth on the Santy's under bonnet/hood body and top of the engine and a spray of WD40 does help keep your rubber pipes supple and shiny...

That's all there is too it really, nothing special I'm afraid, just try to keep on top of it...

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Hope that help's you, anymore questions please ask...

Andy...