Go to screwfix and by 5L of no nonsense de greaser. spray on, leave for 10 min and then wash, repeat a few times to get wost off, then agitate it.
This.... On repainted bodywork maybe dilute 1:1, certainly don't leave it neat on anything fancy for a long time. Will take off all but the worst chain crust. Rinses off very easy unlike a lot of other stuff.
@BrickMan started
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Go to screwfix and by 5L of no nonsense de greaser.
spray on, leave for 10 min and then wash, repeat a few times to get wost off, then agitate it.