Look a little closer
A textile scarf, coated bag and metal ornament can require different handling. Even within one category, finish, condition and mixed components can change the question. An appealing online tip may omit the information needed to know whether it applies.
A note for your design book
Record the object’s identity, declared materials and existing care information before taking action. Avoid testing household solvents, polishing or washing on an unknown or historical object. Use manufacturer guidance for everyday products and a qualified conservator for collection objects where appropriate. This article provides a way to frame the question, not a treatment recipe or assurance that a home method is safe.