I've been looking for an effective way to prolong the life of my shop filters. I've purchased the 'washable' filter cloths that go over the foam filter in a shop vac (washable my ***... mine fell apart almost the instant they got wet. You'd have better luck washing toilet paper.) I'm looking for a material that can surround the filter in a similar manner that is electrostatically positively charged so that once the vac is turned off, the dust will simply fall off the filter. Something like silk or polyester yet wouldn't choke the vac. Has anyone had any luck or have an opinion?