These cannot be cleaned in any way and must be replaced.
According to EN 60335-2-69 The Terms "TYPE H" FILTRATION and HEPA FILTRATION are NOT INTERCHANGEABLE
The HEPA classification only considers the "efficiency of filtration" eg H10 H11 H12 H13 H14 U15 U17 NOT the SUITABILITY FOR USE with HAZARDOUS or COMBUSTIBLE dusts.
As it's light, maximise the saving on postage and buy a couple of packets of dust bags, or a hose or a new floor tool, or some other accessories! See in related parts below.
At the moment, standard postage within Australia is capped at a maximum of $20!