My uncle’s duffel bag

[Timothy-R]

My brother recently gave me our uncle’s duffel bag. It crossed Utah Beach at about D-Day +7, and left the ETO in December 1945. He drove an ammunition supply truck for the US 3rd Army.
Two questions, 1) anyone have insight into the various markings (his name and service number I understand) including the painted stripes?
And 2) recommendations on how to clean it (stored in a cabinet in a dusty pole barn for maybe 15 years) without risking damage to the markings? Dust, dirt, and lots of old spider nests.
Thoughts welcome