I don't know bout commercial, but domestic works a treat. why not give it a go?
I started 8 years ago on windows with my brother, we split the eoubd and my wife wanted to work with me. she was only on min wage as assistant manager in retail so big pay jump, less hassle, and good company (working with me, lol)
couldn't have worked out better, can take holidays/days off whenever suits. customers like having girl on round too, so gud for business. would prob struggle with high stuff but my good lady did 6 years traditionally (with a little help from beer crate to reach windows!) and last 2 years on wfp with 18 foot glass xTel poles