They are easy. Just blade them as normal and give all the upvc a wipe over at the sills unless they want all the upvc done and again just give it a clean with your cloth of choice.If your wfp, even easier.

i cleaned 1 a few weeks ago. 

im new so i dont have WFP but was advised by porto-geezer to get a car cleaning brush from e-bay...so got 1 for £18 including p & p......glad i listened because it worked really well.  make sure your customer has an outside tap or no good to you.

see the thread below for full details and links to the item on e-bay

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