chilliman said:How often do you wash your cover?
I wash the covers every year. They do end up having a noticeable film of algae on them which cuts a lot of light out. The ends need doing inside and out (the insides of the ends get an algae build up because condensation sits in the folds), whereas only the outside of the hooped part of the structure needs doing. I use a long broom with washing up liquid, nothing special. It's a pain in the arse, but a job that needs doing.
The weather is looking good here for the weekend, so I'll be working on a tunnel too; about time because the plants still in pots are gagging to be planted out. Look forward to seeing some photos of your progress.