Printed apparel can be machine-washed cold, inside-out on a gentle cycle with a mild detergent and like colors. Use non-chlorine bleach only when necessary. You shouldn't use any fabric softeners or dry-clean the items.
DTG-printed apparel can be tumble-dried on a low cycle, but hang-dry works best. When it comes to ironing, use cool iron inside-out. Don't iron the print.