her rental hell

Ok so my mate mel has a house inspection at the end of the week she has gas heating :( and the ceiling of her rental seems to be covered in this brown smoke mark (please not there are no smokers)
She is 8 months pregnant and I'm 19weeks with twins she plans on getting up there to do it her self will this hurt her or the baby 
Originally I was gunna do it for her but doctor has put me on bed rest 
So she won't even let me help she is gunna be a single mum and dosnt rely have the help of money to get someone else I'm just worried about her and Bubs health by cleaning it :( it's her first bub