Why isn't compostable packaging suitable for liquid cleaning products?

Because compostable films are designed to break down in moist conditions, they're hygroscopic, so a liquid product attacks the pack from the inside and it can begin degrading before it's used. Compostable packaging is an excellent fit for dry home care: tablets, powders and sheets up to 1kg, certified home or industrially compostable. For liquids, recyclable PCR is the honest, durable choice.