Proper care and maintenance are essential to ensure the longevity of your trench rain anorak. Check the care instructions provided by the manufacturer for specific guidance, but in general, it's recommended to follow these tips: 1. Clean as instructed, either by hand or machine. 2. Avoid using harsh chemicals or bleach. 3. Store in a cool and dry place when not in use. 4. Follow any additional care recommendations based on the material of your trench rain anorak.