TAKE STEPS TO AVOID EXPOSURE
HEPA Vacuum for small quantities only
HEPA filter vacuum cleaners are effective on small quantities of vermiculite indoors.
Never vacuum vermiculite with a regular vacuum cleaner.
HEPA vacuums and wet wiping can be used periodically to remove small amounts of vermiculite introduced into your home.
Use a HEPA vacuum to remove dust from previously inaccessible locations, such as under recently removed carpets, appliances and furniture.
Courtesy of Utah Department of Environmental Quality.
About using a damp towel for a small quantity of vermiculite