Keeping your white atv white?

I just bought a 2016 Sportsman 850 in white. Went out and hit some trails. Next day I washed all the mud off, but realized where your legs rub the atv, its turning into a tan color. Any tips on how to keep it white? Tried just soap and water, that didn’t clean up the leg area. Anyone have any tips!? Pic for attention!

Attached Thumbnails

Click image for larger version

Name:	20161105_192651_1480796077487.jpg
Views:	N/A
Size:	4.57 MB
ID:	64297