that IS good advice  - call the mfgr.
last year tried nik wax tech wash
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and dryer
this year the atsko silicone water guard (the can does state that it allows leather and fabric to breathe but yeah that doesn't necessarily mean goretex/dwr)
i noticed on some forum a couple people called marmot and said the garment was no longer waterproof. marmot had them send it in and replaced it with new. one guy said he couldn't see any damage even though marmot said the coat was "de-laminated".