Once you've been wearing your GORE-Tex jacket for a while, you've probably noticed that its seemingly magical ability to fend off water droplets, losing its originally highly effective waterproofing.
Once water stops beading off the fabric outer, it's likely that it will be totally 'wetted out'. This means that your jacket can no longer sustain fending off constant rainfall, and this usually happens when your DWR treatment starts to fail.
According to GORE itself, the key to getting it back to its as new condition takes a few steps.
1. Wash with a mild liquid detergent, such as the ones suggests above. If you do use a regular brand, use a couple of additional rise cycles to ensure it's not left with detergent residue.
2. Spin on low and ideally allow to line dry.
3. Put the dry garment in the dryer for 20 minutes at a low temperature (60°C) or one dot (heating process).
GORE says that if water still isn't beading after the heating process, apply a waterproofing treatment on the damp garment before allowing it to line dry and then heat in the dryer again.
Remember however to take note that the GORE Shakedry jackets shouldn't have a DWR application applied.
Always read the washing instructions label of any cycling garment prior to any wash and treatment cycle.