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There are several reasons for stains on a Laser printer or photocopier
1. Clean all rollers. Fuser; transfer and pickup.
2. Ensure the toner is clean from outside.
3. Hope the Toner is not refilled and Is not leaking.
4. Clean paper path.
Typically MURIATIC ACID is very useful in cleaning stains from masonary and should work to clean a sudo-masonary stain off of glass. MURIATIC acid is normallly in stock at just about all hardware/big box home improvement stores
The model in your picture is a fixed blade utility knife (model 10-816). Your question asks for instructions for model 10-778, which is a retractable knife. I'll guide you through the 10-778 which you asked for, if you need instructions for the pictured 10-816 please re-post the question.
Push the thumb slide forward as far as it goes exposing the blade. Press the blade change button on the side of the knife (the small button on the left side near the blade) and pull out the old blade.
Insert the new blade and slide thumb slide back to fully engage blade in the internal lock.
If it is a 10-816 then Knife swivels open for easy blade change and clean out - no tools required, much like 10-999 If it is a 10-778, you don't really open it. You press little button on left side, behind the blade wiper, and this releases blade. Push red button on rear of knife, to open blade storage if it is a 10-999 then press the button on rear and rotate the two halves.
Google: how to change blade in Stanley 10-379 utility knife. Stanley website shows how knife & blade look on the outside. Put it together so it looks like that. Sorry, but ain't don't know how to send the picture to you.
a couple of thoughts:
Has your windshield just been replaced?
The sensor is up by the rear view mirror, is it plugged in all the way?
Do you have the right size wiper blades on your vehicle? (too short of a blade misses the rain sensor and does not wipe it clean)
How good are your blades? ( as above, to turn off the rain sensor the blade needs to wipe it clean)
The rain sensor works by projecting multipleinferred beams to the inside of the windshield, like a prism, they reflect back to collectors. when there is a water droplet on the outside of the windshield it changes a beams trajectory and it misses the collector thust turning on the wipers.
(yes, this all happens in that little sensor up by the rear view mirror.)
check to make sure the wiper switch is in the right position. also....I've seen rain sensors not work properly when the hood or doors are open.
hope this helps