[ITSv40]

The method I use is:

Warm the engine - not stupidly hot, but warm. Spray Autoglym Machine Clean liberally over the entire engine bay and work in with a paint brush, apply more as needed and work in with paint brush until muck is loose and emulsified.

Using a garden watering can with a rose fitted wash off with clean warm water from the hot tap. usually two to three watering can fulls is sufficient.

Whilst still wet, spray Autoglym Vinyl and Rubber Care liberally over the entire bay and engine. Start engine and take for a drive of 15 -20 mins, return home lift bonnet and leave to cool whilst having a cup of tea, coffee, beer - insert refreshment of choice. Then buff top surfaces with a microfibre cloth - I remove the engine cover to make sure there is no residual moisture underneath. Job done - takes all of an hour and little effort. I repeat as and when needed.

Attachment shows the C70 after cleaning.