Bathroom vent not strong ample, discoloring on walls beside make notes on paint? When I first purchased this 1962 Cap Cod home in 1996, our...

When I first purchased this 1962 Cap Cod home in 1996, our full tub didn't have a vent. The bathroom is give or take a few 8x8, so I purchased a 75 cu. ft. vent and light thinking that would be adequate. I was wrong.
We normally have the trouble of taking a hot shower and the bathroom steaming up. When I first placed the bathroom hanger-on in the ceiling, I cut a hole surrounded by the roof and attached exhaust ducting (the plastic flexible kind, resembling for a dryer). Although some steam went outside, most of it wound up on the walls and ceiling of the bathroom. So much so, that it discolored the walls.
We not long remodeled the bathroom, and purchased a bigger cubic ft. exhaust fan (125) thinking the problem be that the old aficionado wasn't sucking enough. Since I considered necessary to make sure that it would work, we wait to see if the fan be strong enough to exterminate the discoloration problem. The new, larger devotee still didn't work. Someone suggested using metal flexible ducting instead. Will that work?
Does anyone know how to fix the softener...
Answers:    Smooth galvanized steel ducting is the best. The flexible description creates more friction to the moving air and the disciple motor can't push as much through as fast. Checkout the installation tips at http://www.askthebuilder.com/546_Bathroo... especially the fragment about insulating the duct to avoid condensation streaming subsidise down it. That would not only come stern into the fan, but also increase the atmosphere friction even more.
What do i use to stick victim tiles...
Ducting is Ducting Metal/Plastic both ends are open.,
Bigger Fan, Again or Install a pane that of which are generally jammy to DIY the biggest problem with that would be what type of exterior walls do you own., Wood, Vinyl & the Like (Easy)- Stucco (Less Easy More Money)

Good Luck!