I'd stick to your guns....never ever drop your price.
I also have never texted a customer to ask them if their happy with their clean and never would.
I had a customer today who let me clean their back windows,side ones and when I got round to the front windows had stuck a note on her front door saying 'can you skip my windows today,thank you'

....dumped!
I've picked her neighbour up so replaced the job already. It's not the first time she's stuck a note on the front door,it's probably happened 5 times in the last 2 years and always if it's a bit of light rain.
You can't lose in this game!😎👍