Well washed my pad with 'Nanas Wool Wash'. This is a Eucalyptus oil based hand washing product for woollen clothes and is biodegradable.
Half a basin of warm water, lid full of product submerge pad, rub gently and leave to soak for 5 mins. Rinse out pad in warm water only and press within folded towel, then leave on a drying rack until dry.
As seen in photograph the pad is now quite serviceable.
Whilst this specific product may not be available in your country, look for a Eucalyptus oil based hand washing product for wool.