- Overlap 3 layers of cling film 1500 mm long (see photo 1).
- Place them in the gutter. Leave about twenty centimetres of cling film at one end of the gutter (see photo 2).
- Attach the cling film to the other end of the gutter (see photo 3).
- Secure the cling film along the entire length of the gutter (see photos 4 and 5). Make sure the cling film conforms to the shape of the sock.
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