Using these sheets is a breeze. First, put the fitted sheet on your queen - sized bed with the 40cm depth. The tags on the sides will help you place it correctly. Then, slip your pillows into the pillowcases. For maintenance, you can wash these sheets in a regular washing machine. Use a gentle cycle with mild detergent. Avoid using bleach as it may damage the fabric. After washing, tumble dry on low heat to keep the cotton soft. Hang them to dry if you prefer. With proper care, these sheets will stay in great condition for a long time and continue to give you a comfortable sleep every night.