I use new dusters
£1 for 5 or 10 depending on where you get them from
The fibers are very thin so take a spark very well
Whatever you do don't make any charcloth when Mad Dave and Dr Jones are anywhere near you.
As Drew found out once the perfectly formed charcloth that he made miraculously changed back into pristine dusters whilst cooling in the tin and he was accused of buying fire retardant dusters...