Steve,
I dont know how much detail you require as you say youve been doing windows for 3 years wfp.
You will obviously need a ladder, small step ladder, telescopic pole, a good collection of scrims, and microfibres for leadeds , a couple of applicators, a selection of squeegies. I use up to 14" . A Poo scraper. I use old towels or T-shirts for sills cloths. A Tool belt, or belt on a bucket.
Personally I use Unger equipment and hard Unger rubbers, which I find are the best, but not everyones choice.
I use Fairy, and find it better than the products like Squeegie Off and gg3-4, much cheaper,same quality finish IMO, and ive tried em all.
AND FINALLY A BUCKET.