I have a newer BH it's now almost 3 mos. old....my question, it's FRIGID cold here - is there something I should do to care for my purse? how about the leather and the monogram canvas? How often should I care for it - put something on it? Every 3 mos? i have no clue -please advise , it's so cold here and I just want to make sure my purse stays in pristine condition! thanks!! ps: do you use something different on the leather straps and then something else for the mongram canvas?