Chorlton is correct. Using a normal deteregent wont harm the jacket. However there is a small residue of detergent left after washin, and this is hydrophylic (absorbs water). It also impeeds the breathability as mentioned above. To prolong the life of your jacket i would was in a techwash (pure soap) and re-proof using something like a Tx-Direct reproofer (both made by nikwax). Applying heat, if possible, will give you a more durable and longer lasting finish….
