How to Wash and Care for a Waterproof Trench Coat

Maintaining the waterproof integrity, 5,000 g/m² breathability rating, and fabric performance of your outerwear requires correct laundering techniques. Dirt, sweat salts, and outdoor oils can clog breathable pores over time. Follow this step-by-step guide to keep your technical jacket in peak condition.

Step 1: Prepare the Garment for Washing

Before cleaning, close all zippers, secure the snap-button cuffs, and loosen the adjustable drawstring hood and cinchable waist cord. Clear out the two deep zippered pockets. Brush off dried dirt or mud with a soft damp cloth.

Step 2: Wash with Mild Technical Cleaner

Place your 100% Polyester garment into the washing machine. Use a specialized technical cleaner like Nikwax rather than standard household detergents or fabric softeners, which leave residues that destroy durable water repellent (DWR) coatings.

Set the wash cycle to gentle at a wash temperature of 30°C. Thoroughly rinsing away all cleaner restores breathability through the breathable mesh lining, as highlighted in [the main guide].

Step 3: Re-apply DWR Water Repellent Treatment

If water stops beading on the outer surface during heavy rains, re-waterproof the shell using a wash-in or spray-on Nikwax reproofing formula. Ensure even application across high-exposure zones like shoulders and hood seams.

Step 4: Dry and Store Properly

Hang the garment to air dry away from direct heat sources or high heat dryer cycles, which can damage sealed seams. Once completely dry, store it on a padded hanger or pack it neatly into its pocket for travel.

Read the full guide: How to Dress for Humid Rainy Weather: The Complete Style & Performance Guide