I feel like I maybe haven't earned the right to post about this since I haven't been doing Tarot as long as many others here have. THAT SAID, ;-) I just use a little of what I've read but mostly instinct, and I only do cleansing when I sense it's needed, and may use a different method each time.
I always keep the decks in silk and in their own cloth bags (actually, now that i think about it, I think these bags have silk linings, too - they're great bags by the way, that on the outside are almost quilt-like, with different colors of part silk, part felt or velour, part something else, with drawstrings with little charmy things hanging on the ends of each string...simply lovely). Anyway, now and again I use incense or sage and use my hands to kind of wash the smoke over the deck. One time when I didn't like the person who'd picked up my deck and started playing with it without asking, I went through each and every card and rubbed it between my hands! Other times I just shuffle a lot, and often I use my hands and kind of make a brief shooing motion over them as if blowing away the previous reading's energy, before wrapping them back up in silk. I have french doors that go out onto a deck and sometimes I'll set them by there for fresh air. I LOVE the idea of putting them by the speakers!
I agree that to each his own!