Active job

Preparing roof for painting (pensioner cottage)

I would like someone to make sure that the corrugated iron roof of my mother's pensioner cottage is prepared for painting. I'm guessing that it will need to be washed. I think it is in fairly good condition, but there may be a couple of spots of loose paint that need to be removed. She lives in Appleby, Invercargill. Her house area is 70 square metres, so I'm guessing that the roof is about 72 square metres. We would like to keep costs as low as possible, so I can help. I mainly want someone who knows what they're doing to check that the surface is prepared properly.