So, I was working on an old tiller (late 60's Sears-big ornery thing that can be tough to use till you get the hang of it). Got it (mostly) done/running and came in the house for supper.
So, I'm standing at the sink in the bathroom washing my hands. I get them all lathered up with Dawn dishwashing liquid and scrub around and then rinse them off in the warm water.
Darn, still got some greasy/dirty spots on the back of my hands. Squirt some more dawn on them and scrub, rinse them off, the spots are still there. So I grabbed a 3M green pad, squirted some Dawn on it and started to scrub. Rinsed it off. Still there. I get to looking closer and the darn brown spots are old age spots. They ain't washing off.
Funny, never paid much attention to them and I know they didn't just appear over night.