Always read and follow the care instructions and any warnings on the garment label. And, follow the General Rules for washable fabric stain removal.
Use a soft eraser to remove what excess lead you can. But, be careful so you do not damage or stretch the fabric.
Spray the stain with a pretreatment product.
Rub the area with a heavy-duty liquid detergent. Rinse and launder.
There are also commericial pencil mark removers available in some quilt supply stores.
ZYIA - Item 889 - Black Peak Zipper Jogger
Inspired by classic athletic warm-up pants, these joggers offer the super-smooth feel and performance of our four-way stretch legging fabric, but in the casual cut of a jogger. The elastic cuffs are also equipped with stylish vertical zippers to make it easy to take off without removing your shoes.
ZYIA - Item 3511 - Men's Gray Track Sport Jogger 31
The supreme, heavy-weight fabric gives this design a substantive feel that's breathable and packs the perfect amount of stretch. Articulated detailing at the thigh, knee, and crotch deliver contemporary styling and comfort. There are front hip pockets, cord-style drawstring, and invisible ankle zips.