Been working at Castrol today and spotted this, was sceptical till i tried it, it cleans hands as good as anything else I have tried getting oil and grease off with no problem. Perfect for keeping in the tin top if you have too change a wheel or something.

Managed too blag a couple, don't know what it sells for but if you see it buy one, it works.
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Fast Orange is an alternative, can be used with/without water and contains powdered pumice so it can really get at the ground-in dirt. I've had my 3 litre one for about 6-7 years and it's great