If the transfer is sealed properly than the general washing instructions of most printed garments is also applicable here: Maximum of 40°C on gentle cycle, do not tumble dry, do not bleach.
If these instructions are followed the customer will be able to enjoy the printed garment for a long time. It is especially important to provide the end user with clear instructions on the washing. This prevents mishaps and disappointment with the customer as they know how to handle the garment when washing it.