One wrote: “It’s a toothbrush job. Scrub and wipe then do a wash with bicarbonate soda.”
Another added: “Use a toothbrush and bicarbonate spray.”
“Try a mold and mildew spray and rub with a toothbrush,” a third suggested.
Another homeowner agreed, adding: “I used bleach to remove mould and then did a vinegar and bicarbonate soda hot cycle.”