In days of yore, ie BME, I used to do all my own car maintenance and generally got rather mucky. A quick jam of the old digits into the boss's washing machine powder, a drop or three of H2O and off all the muck came. Then I discovered Swarfega – the green version – which I think is probably better for the hands than detergent powder.
I find that Swarfega along with a scrubbing brush – as long as it is a decent stiff one, and not a namby-pamby ladies gentle skin tickler one – does the job satisfactorily.
Recently, Aldi had a pack of disposable latex gloves going remarkably cheap. Perhaps as well because it would be remarkably easy to damage three or four a day. I've now, after only a few days gone back to bare hands.
I did find with these gloves that they became extremely slippery once they came into contact with cutting fluid or oil. Ok, it wiped off easily, but in the end, I'm not convinced.
I've also used paraffin to get the really deeply engrained stuff off, WD40 if it happens to sticky stuff or methylated spirit for Araldite, and sometimes white spirit/turpentine for paint. I've even used that horrible solvent for Hammerite paints. But, these days I do wonder just what damage these items are doing to the skin so I can't really recommend any of them. Of course, after using these liquids I usually have a good handwash with good old soap and water. Perhaps the answer may be to reserve the gloves for use with the worst of these solvents.
Regards,
Peter G. Shaw
(BME – Before Model Engineering)