A number of years ago we were asked to clean the fronts of a house across the road from my wife's sister-in-law.
I asked him if we were to include the garage door in the quote. No, he didn't want his garage door cleaned. So we did as asked, but this garage door was filthy and bugged me.
One day when I was doing the fronts, 2 old ladies were walking down the pavement. I don't know if one or both were partially deaf, but they were talking loudly to each other.
"That window cleaner works so hard and does such a lovely job. But that dirty garage door lets all his hard work down."
I decided then that I would clean that door. As Mattymarske says, your clean is your advertising board and that dirty garage door was ruining my reputation. So I clean that door when it starts to get a bit dirty. What a difference a clean door made to the presentation. I do that now, not to get extra payment, but for my own reputation. It doesn't take even a minute to run the brush over it.
As regards gutter cleaning on conservatories, we clean them every time when we clean the windows. Always have. Again, it's just a quick brush over, but it makes a world of difference to the end result. For me, it's not always about what a customer will accept, it's also about how I feel about the quality of the service I'm providing. It's about me. Our business has grown through customer referrals.
I'm also not saying anyone who doesn't clean the underneath of a customer's conservatory gutters is wrong. My son thinks differently to me. We each have to run our business in our own way and it's always best to continue to do what works for you.