Stain wont harm u unless u have ultra sensitive skin.
Use a little soap powder(washing machine powder) add water rub hands together and Walla the abrasiveness in the powder is excellent for getting any thing off your hands
nothing really too serious to worry about.
use cotton rinsed in thinner / turpentine to wash off the stains.
Laquer Thinner in what I use, If you have waited to long - try soaking your hands in a peroxide and water solution. It will were off in a few days with regular bathing.
it will come of after a few showers. I wouldnt worry about it