Also, I've found that the additional use of a dish type cloth help a lot with Fairy Liquid - the cloth seems to help removing grime from the troughs in your fingers. For paint on my hands Fairy Liquid on one of those soft green pan scourers attached to a small sponge works well.
The downsides are that the fingerprint reader on my phone and laptop don't work too well for some time afterwards. I have more than one method for logging on.