PVA bag/film for pack blue bubble to clean watercloset
1.PVA Film/bag
2.Cold water soluble film/bag
3.pack clean chemical

PVA Plastic Film can be thrown into toilet tank together with toilet cleaner(Blue Bubble) for its good water solubility,and there will be no any remnant left after the cleaner used up,thus aviod person directly contacting the harmful thing.