I have just been cleaning the glass on the greenhouse, it was filthy. I asked the men on site how often they cleaned theirs. They looked at me as though I had just escaped from the loony bin.
I have got one of those sponge on one side and blade on the other things for windows which has a hollow handle so it will fit on to the end of a broom handle. Or hoe handle if you do not sweep. It was from the pound shop. You could tie a bit of old toweling round a broom head even, it would do a good enough job.
I have not got to use that bit yet, I do not fancy cold water going up my sleeves and any way it started to rain. Probably a good time to do the out side, a wash with rain water.
I had the slightest bit of kitchen spray left in a spray and so I filled it up with water and it seems to have got the muck, birdy poo and the odd bit of green mould off.
Vinegar or touch of ammonia will do in water, don't splash it on the seedlings though, but neither will hurt the soil if it spills.
Glad that there is more than one of us who is odd. It does look a lot brighter now though, must be better for the plants to have as much light as possible.