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