READER’S TOP TIP

Liquid Soda Crystals will kill garden moss but wait for dry weather before applying. When the moss goes brown you can just scrape it off.

Q

Do you know of any grey paint or spray that I would be able to use on my double-glazed windows and doors? I would need it to be waterproof – for example, resistant to rain, window cleaning and a jet wash.

Michael Smith, by email

All types of paint will tell you whether they are suitable for interior or exterior use – just read the back of the tin. Blackfriar Paints are excellent and Rust-oleum do amazing aerosol paints too.

A