Not sure Morocco's more sandy than many other places in the world you'd be riding off pavement, but aside from that consideration I just sprayed with WD40 as often as I thought of it, and my chain lasted from Germany throughout southern Europe, ex-Yugoslavia, a month of Morocco and all the way up to Tromso...about 15,000 miles/25,000 km. Exactly as long, in other words, as it would have if I'd been taking proper care.
I wasn't taking proper care. My theory, which others share, is that anything sticky attracts stuff which I don't like. WD 40 is mainly just a cleaner which happens to come in an aerosol can, doubles for drying out wiring, and is easy to spot on store shelves. This self-justifying theory allows me to do what I'd do anyway, but with a clear conscience. I don't use a brush either: spray, sometimes wipe, then ignore.
Mileage, they say, varies.
Mark
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