A bag includes a sealed hollow body and water-soluble powders contained in
the body for removing an oil film on a windshield of a vehicle. The body
is soft and permeable. Preferably, the body is water-absorbable.
Preferably, the water-soluble powders are made of an inorganic material
selected from a group consisting of magnesium oxide, calcium oxide,
manganese oxide, copper oxide, calcium silicate, silicon dioxide,
aluminum oxide, iron oxide, and mixtures thereof.