For the 93 Hummer's the stock replacement blade is the Trico 60-1150, it's a 11 inch wiper blade that is not in most automotive store's stock. One of the places that I did find who carries it here in Houston, was NAPA Auto parts.
The blade is screwed to the wiper arm as shown in the photos.
But, since 1977, I have been using Rain-X on my windshields and do not use my wiper blades. On the Hummer I have removed my wipers and store them inside the cab, just in case. (And for Texas DOT inspection)
Rain-X will last about one month or so and does not hold up well if you use your wipes. Even using Rain-X, the windshield must be cleaned, wiping the windshield clean with a damp paper towel will almost restore the protective properties of Rain-X to like a fresh application. Also, if I know there is a chance of it going to rain, while it is dry I will apply a fresh coat of Rain-X.
When I am out of town and I find that I must rent a car and I know there
is a chance of rain, I will apply Rain-X to the car. I hate to be driving
a car in the rain with the wipers on. In fact I find that I get a
cleaner site of the road then when using wipers. The heavier the rain,
the better it works. But the morning dew is the worst part of using
Rain-X, so I try to wipe the windshield with a nice warm damp rag and this
helps prevent the dew from forming.
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