If you don’t have any of the plastic mesh bags the method I use to get sticky flour off my hands is to take a small bit of dry flour and rub it in your hands.
Sharing my all-time favorite baking tip — save those plastic mesh bags that lemons, limes and other produce comes in and use them to scrape the dough off your hands and bowls. Gets all the bits off and your sponge isn’t filled with congealed dough at the end.