Wet & Forget – Mould Lichen & Algae Remover costs £26.98 for five litres from Amazon.
Wet & Forget Weekly Shower Spray Cleaner costs £29.99 for two litres from Lakeland.
Other suggestions from Mrs Hinch fans included using Pink Stuff, sodium hypochlorite, washing powder and bleach.
Jackie Styles said: “Pink stuff and a stiff brush.” Karen Davidson suggested: “Sodium hypochlorite. And a stiff brush.”
Sarah Taylor replied: “Garden maintenance guy told me to sprinkle cheap biological washing powder on it.