The message
from "Pat Gardiner" contains these words:

I suppose there comes a time in every polytunnel life...it starts to look
disgusting

I can work out that a squeezy mop will remove the green on the outside, but
what should I use as a chemical?

Something harmless that will still do the job of loosening before using a
hose?

There are Kiwi below, near the sides on the outside and I'm still silly
enough to believe they will fruit one day.

Regards
Pat Gardiner
www.go-self-sufficient.com

I just use a mild solution of washing-up liquid. It seems enough to
shift the green. I find a soft broom works well but a squeezy mop sounds
good too. There's always a bit right on top which I can't reach, so only
two thirds gets cleaned.

Janet G