Rain, dusty journeys and damp storage call for different care. Start with the maker’s instructions for the actual material and finish.
After rain
Blot surface water gently with a clean cloth. Keep the piece away from direct heat and strong sun while it dries in a ventilated place. Use clean, unprinted support material if needed to retain its shape. Drying time depends on the construction and conditions; a fixed number of hours cannot guarantee that the lining is dry.
Once dry, inspect the surface. Apply a treatment only if it is suitable for the finish, following its instructions and testing an inconspicuous area first.
During dusty weather
Remove loose dust gently with a suitable soft brush or clean cloth. Pay attention to folds and seams. Check for wear, stiffness and damaged edge finishes. Do not treat dust as proof that the leather needs more oil, or apply conditioner on a fixed fortnightly schedule regardless of condition.
Between wears
Allow footwear and linings to dry between uses. Rotate pairs when practical and use correctly sized supports if recommended. This can support care, but it does not establish a doubled or tripled lifespan.
If mould appears
Keep the affected piece away from clean items and seek material-specific cleaning advice. Avoid brushing spores around occupied rooms or applying a universal vinegar recipe. Mould can damage leather and poses exposure concerns; it is not always harmless surface dust.
The Canadian Conservation Institute’s mould guidance explains why controlled cleaning and precautions matter. Its conservation procedures should not be treated as a home-treatment recipe for every bag.
Ask a suitable leather-care professional before treatment. Identify and address the damp storage conditions as well as the visible contamination.