By Kirk Miller Want a clean house? Today is your day. Right now it’s around 30% off air purifiers and vacuums from Dyson on the brand’s official eBay store — although that discount is higher if you include a few vacuum-related accessories (note: we’re not going to include those, nor the Dyson lamps or hair straighteners, but there are deals to be had there as well). Below, a few cleaning sale standouts. Bonus: Most of these items (both new and refurbished) arrive with free shipping and returns, plus a two-year warranty. And you can get an extra 15% off refurbished items with the code SHOPREFUR…