at the end of the day lots of us who have been window cleaning for many years and are well established have done all the pain in the arse jobs(gutter clearing/inside window cleaning,inside conny roof cleaning etc)and can choose to not do this work due to having enough outside window cleaning to be getting on with....
i even turn down outside window cleaning jobs half the time if their not easy access jobs!
the main reasons i hate inside window cleaning are
1.you have to book them in no "turn up and clean".
2.i really dont like being inside a customers property.
3.a chance of being accused of stealing something(it has happened before)
4.clutter on window sills/blinds/ornaments and general stuff you need to get around to clean the windows.
5.often ive ended up sweating buckets as ive been used to being outside all day(even in winter!)its a nightmare cleaning inside a conny for example in bright sunshine....
for me its so much easier to refuse these jobs and just crack on with my scheduled outside work.it makes me happier.