I have never delved into this, one of my customers asked me to do them last year as the fitter said get them cleaned twice a year to increase efficiency, I told him I didn't do them but may look into it? Anyway I've been asked by another one now so I'm thinking of maybe doing them? Problem is I don't know what pole to use, I have a SLX 18 and an SLX 22. Now obviously they won't reach so was thinking of adding sections to the SLX 22. Now I'm guessing that you probably need a SLX 35 so do I just add section 5 and 6 to make it a 35ft pole? Been puzzled by this as there is a SLX 25 which obviously is 3 foot longer than a SLX 22 but there isn't a 3 foot section is there, I thought all sections were 5 feet? Ideally I want to do both jobs together as I've got the added pain in the @rse of removing the base cap and adding the sections on. Can't justify paying over £800 for an Extreme pole because the pole would hardly be used, the price of those poles needs to come down.