Awoke to find the sunniest day for many weeks / months - so decided to give the engine-bay a Springclean. Four months of salt, grit and many journeys through slush had left the engine-bay a sorry sight. So out came the AutoGlym Engine & Machine Cleaner - followed by AG Vinyl & Rubber Care. The plenum area just ahead of the wiper spindles was pretty bad with the black plastic looking grey and mottled due to the effects of salt spray and concentrated screen-wash - easily fixed though with a bit of AG Bumper & Trim Care applied with a 20mm round paintbrush. After a two-hour clean-up I'm now a happy bunny.