I'm planning an overnight soon with a couple of friends, and since my Highpeak Enduro tent is tight with just 2 people, my father in law let me borrow his North Face 3 person tent just to use for the trip. The problem is, it's not his better tent - I think he gave me his older one in case anything happened to it (I can't blame him, tents are expensive). While it's older and smells like mildew, it's still perfect in terms of function.
So here's my question - how can I remove the mildew smell without effecting the waterproofing of the tent material? I have seen home remedies involving laundry soap, lemon juice, etc - but these all seem pretty harsh and I'm afraid they'd ruin the waterproof coating on the tent.
I'd really like to return this to him not only in good shape, but smelling nice too - I think he'd appreciate it.
P.S. Yes I did a search for this topic, and while I found lots of suggestions, I wasn't sure which ones were okay for the waterproofing