Normally a customer wants it 2 monthly if they cant afford to have it done monthly i find, i dont charge more for 2 monthly myself but respect to th guys that do charge more and get away with it.
Same here after the first clean I'm just as quick on 4, 6 and 8 week cleans so don't need to charge extra.
Plus I like the fact if I clean after 8 weeks the customer will notice that the windows have been cleaned
without looking too closely.
Which is good for me as I'm 100% splash and dash.
I reckon about a third of our work is every-other-month; and we charge extra. I agree it doesn't take any longer to clean them, but they're worth less to me, so I charge more for them.
I haven't explained that very well; here this may help.
£10 @ once-per-month = £120 a year.
£10 @ every-other-month = £60 a year.
So we charge about 20% more for the every-other-monthers because we can, and if they refuse, well, we've not lost much.