What do you recommend as the best solution to wash through the greenhouse?
I was advised to use Jeyes fluid. Haven't had to do it for a while, but I assume it's still available.
I put plenty of washing up liquid in some water and brush the soap mixture all over everything, leave it whilst I fix up the pressure washer then wash it all back off with that. There is no soil in the green house so the soapy water also washes the gravel and paves, two birds one stone as they say in these parts. "oh" I do take everything out first, plant wise that is, the staging gets washed.
I use a jeyes fluid mix in early spring and then hose it down to rinse
Armillatox, a lovely clean smell not at all like Jeyes fluid, good to clear algae off patios and paths, as well, do it now when the glasshouse should be clear of crops.