They should be machine-washed on cold, inside-out on a gentle cycle with a mild detergent and like colors. Also use non-chlorine bleach only when necessary, such as if its a white garment. You shouldn’t use any fabric softeners, or dry-clean the items.
To dry tumble-dry on a low cycle, but hang drying works best.
When it comes to ironing, use cool iron inside-out. Do not iron the print.
Be wary of washing and drying on a high setting, especially when the garment is 100% cotton. High-temperature washes can fade and crack the print, and a high-temperature dryer settings can shrink the garment, as well as damage the print.