I only keep a set of steps for the occasional back gate. I haven't climbed a ladder in over 2 years and don't plan to again.....I heard last week of a local window cleaner being unable to do his work due to a ladder fall, this is someone who has been window-cleaning for at least 10 years, ie with 10 years or more experience of ladder work...a dirty piece of glass is simply not worth the risk, in my humble opinion.
Mark