£60-£80 depending how dirty it is.it looks easy enough.you can use a ladder to get on the flat roof at the back of conny which will make this job a whole lot easier!!
i would clean all outside gutters and windows on the conny as well but NO gutter emptying!!
it would take no longer than 90 mins including set up and packing away.
take it or leave it.
most customers dont realise how long they take to clean to a good standard.
regards
dazmond