Rain is rain. Rain on dirty windows makes mud. Rain on clean windows should mostly sheet off if the windows were cleaned thoroughly. If windows are fairly close to the ground and dirt splatters up and makes a mess of the windows and the customer ask about then I tell them to give me a call if it rains in the next few days and I will come out and do a courtesy clean to get that dirt off. I've thought about just giving a 7 day rain guarantee, just be somewhat courteous.

What's everyone rain policy?

here in the UK we tend to work in light to moderate rain.....unless the customers out and then we crack on
some do mention a rain guarantee

I think if anything wind is more of a problem

There are a few tricks that you can figure out and basically get some free money but if you're just starting that policy seems fine so just go with that

I do have a rain policy too but I've had people abuse it sometimes so I had to tune it down a bit, a 10 day policy is fine