Canvas bags and covers often need a gentle reset rather than a hard scrub. Shake out grit, pretreat marks, and wash cool with a mild detergent.
Work with the material
Shape the item while damp and air-dry away from direct heat. Check care labels for coatings or waxed finishes before washing.
Build a gentler habit
Good canvas becomes better with a little softness, but only when the fibers are not rushed.