The wool must be clean. Leave it overnight in water and liquid soap.
VOA: special.2010.08.02
Together they have, for instance, understood that Ghanaians prefer liquid to solid soap for hand-washing and are more likely to wash their hands before eating if the soap does not smell too strong (since Ghanaians often eat with their hands).
Aluminum foil as glassware scrubber: To get baked-on food off a glass pan or an oven rack, use dishwashing liquid and a ball of foil in place of a steel-wool soap pad, says Mary Findley, president of the cleaning-products developer Mary Moppins.