Getting rid of damp and mould
Mould should be removed from surfaces as soon as possible. This should reduce the chance of it affecting your health. It also stops it spreading further. To remove it you should use a damp cloth (to prevent spores from going into the air) and a suitable mould killer. You can buy products designed for this purpose or use diluted bleach. Follow manufacturer's instructions and safety precautions such as wearing gloves. More natural substances that have anti-fungal properties such as white vinegar, tea tree oil or grapefruit seed extract can also be diluted and used.
If the dampness is due to a leak or rising damp, repairs will be needed. Property owners may need a damp specialist or plumber to provide advice and carry out works. Once works are carried out, it can take a several weeks or sometimes months for the affected surfaces to dry out. It may be advisable to hire or buy a dehumidifier to assist with the drying out process. In rented properties, landlords would be expected to cover the cost of hiring and running these. Re-decorating (and re-plastering if needed) should only be done when the drying out process has finished. If condensation is the cause there are steps you can take to avoid it.