A valued commercial customer asks can you clean the internal glass please?
If you have no trad skills you either say no and lose money and face
or sub it out - and lose money and face
or do it and hopefully develop a new skill ( or get sacked for a bad job)
Personally if I was starting out I would want to learn all aspects of the trade as I have. I charge top dollar now for providing a quality service. I cant remember the last time I turned a commercial job down. Big or small I want it all...LOL
The is a guy local to me, he has wfp but cant do trad, because he has never bothered to learn how to clean glass properly he is getting a bad name. He used to clean telephone boxes trad but thats it. If a customer asks for trad he says no!!! Madness in my opinion. I offer to show him, but he didn't want to know, there is no helping some people