try gettin some drum, cymbal, hardware bags...blankets will only protect it from dust, pero yung corrossion or oxidation ata as they call it (stage before rust, yung di na shiny)will still set in...i have experienced this kasi i used to always leave my kit with blanket cover naka-display sa room ko, whenever i leave town, tapos when i get back after a few months wala ngang dust pero yung hardware hoops, lugs, stands medyo naging malabo yung finish so kailangan pa-linis again, engineers have told me that this happens to metal whenever its exposed to varying degrees of temperatures specially in conditions where patay sindi ang aircon kasi sa moist sa humid atmosphere natin. so what i do so that i wont have to clean it each time i get back is i place the hardwares in old luggages/maletas, tapos yung drums inside different sizes of boxes, tapos yung cymbals inside cymbal bags shempre. yung cymbal bags shempre have to be padded, tapos i pad drums and hardwares with newspapers (good insulator for moisture!) within the boxes and maletas.
i dont know if this sounds convenient for you pero it works for me kasi i leave my kit just lyin around on months on end whenever im out of town. sayang oras ko and money if pag uwi ko kailangan ko pa linisin yung kit. plus i like the feeling of opening boxes to reveal the toy i have been longin for while away.