HP OfficeJet Pro 8600
I must have dust inside my scanner, how do I clean the optics

Experienced technical support provide their insights in answering this question :
There’s a small glass on the left side of the big one. There’s one Torx screw holding it. Remove the glass and you have access to the optical mirrors. You can either blow it out with an air can or use a cotton swab and clean the mirrors with that. If the mirror assembly isn’t parked under the glass, then start a copy with the ADF and when the mirror parks, pull out the plug.

How to Identify and Fix Common printer Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced technical support :

Step 1: Unplug the power cord from the scanner. Step 2: Using a soft, lint-free cloth, like a microfiber cloth, wipe off the dust from the scanner glass. Step 3: If the glass has smudges or other contaminants, use a little bit of glass cleaner on a microfiber cloth and wipe the glass.
HP has determined that 99% of all lines and streaks on copies made by feeding the original documents through the ADF are caused by debris on the ADF glass. Debris can include dust, paper or toner dust, residue from sticky note adhesive, correction fluid or tape, ink, fingerprints, and more.
Apply glass cleaner sparingly to a soft, lint-free cloth and clean the glass. note: Use only glass cleaner. Avoid abrasives, acetone, benzene, and carbon tetrachloride, all of which can damage the scanner glass.
Never use alcohol, thinner, or corrosive solvent to clean the scanner. These chemicals can damage the scanner components as well as the case.
Flatbed scanners have a broad glass scanning surface that helps to keep documents flat. Accidents can crack or shatter the glass, but leave the scanner otherwise usable. Replace the broken scanner glass yourself to save your business the cost of purchasing new equipment.
Look for the contact points on the print carriage inside the printer and gently wipe them off using a lint-free cloth. Make sure there isn`t any ink left on the printer contacts. Just as on the ink cartridges, if you are having difficulty removing the excess ink, use a cotton swab and mineral water until it is clean.
After disconnecting the leads to the top cap, the optical disc and sensor can be cleaned with a cloth or cotton swab lightly dampened with alcohol. Avoid dripping moisture into the unit to avert any possible damage.
Black copies or images scanned into the computer are typically caused by dirt or white out on the scanner unit. The scanner unit is the mechanism that reads in the documents that are being copied or transmitted.
Horizontal lines are an event in time. Rainbow colored lines might be due to a flickering lamp. Or the scanner has an internal high frequency power supply for the lamp, and it might cause such a problem.
Clean the outer case with a cloth dampened with mild detergent and water. If the glass surface of the document table gets dirty, clean it with a soft dry cloth. If the glass surface is stained with grease or some other hard-to-remove material, use a small amount of glass cleaner and on a soft cloth to remove it.
Is It OK to Clean Glasses with Rubbing Alcohol? Rubbing alcohol, or isopropyl alcohol, should not be used to clean eyeglasses. This harsh chemical also runs the risk of damaging the lenses, their special coating, and the eyeglass frames.
Cleaning the Screen

If your screen is still dirty, apply a small amount of 70~75% isopropyl alcohol (IPA) solution to your cloth and gently wipe down the exterior of your screen. Alternatively, you can also use a 70~75% IPA wipe.

Don`t use paper towels because they can leave dust on the glass. Don`t use compressed air because it can force dust under the glass, which will need removal by a professional cleaner.
A damaged glass surface can decrease the scan quality. Never use alcohol, thinner, or corrosive solvent to clean the scanner. These chemicals can damage the scanner components and the case. Be careful not to spill liquid into the scanner mechanism or electronic components.
This should work indeed. What you will want to do is to visit all of your local thrift stores and look for an old scanner for $5 or so. The glass is easy to remove, usually held on with double-sided tape. Since they are tempered, they are almost impossible to break during disassembly.
Clean the scanner glass and parts. Fingerprints, smudges, dust, or debris on the scanner glass, under the scanner lid, or in the document feed slot can cause lines and color bands. Clean these parts with a soft, lint-free cloth sprayed with glass cleaner.
Alcohol that is 90% pure also works well. You can use 70% pure isopropyl alcohol, but if you do, you must wait much longer after cleaning to ensure that it is completely dry. For example, 99% isopropyl alcohol might dry in as quickly as one minute; 70% isopropyl alcohol can take as long as 15 minutes.
To clean your printer, you need rubbing alcohol, a cotton swab, a vacuum cleaner or canned air, and a clean cloth. If you see streaks or the paper is smeared, clean the platen or roller to remove built-up ink. Then use the vacuum cleaner or canned air to remove any remaining ink or dust particles from the printer.
Combine 3 parts rubbing alcohol with 1 part water – we like to pour everything into a small cup so it`s easier to stir together! Add 1-2 drops of dish soap then mix the ingredients together using a spoon. Pour the mixture into a spritzer bottle (Pro Tip: Use a funnel for minimal spillage!), then voilà!
Some tips to clean dust in the lens:

Blow the dust with a blower or brush off the dust with very soft brushes recommended for cleaning lenses. Use lens cleaning solutions on lens cleaning tissues that are recommended by the lens manufacturers, to remove smudges due to oil or sweat.

DIY sensor cleaning is completely safe. As long as you do it the right way, you shouldn`t have any problems. Many photographers regularly do their own sensor cleaning without any issues.
A final wipe with methanol is recommended since methanol does not leave streaks on the surface like acetone. Isopropyl alcohol is also effective, but it too can leave streaks like acetone.
A good solvent to use is a mix of 60% acetone† and 40% methanol. (Acetone alone dries too quickly to dissolve all of the debris. The methanol slows the evaporation time, and also dissolves debris that acetone alone would not clean.)
Under normal use most people should not clean their optics more than once a year. Exceptions do exist though. If the optics have collected any contaminants more harmful than just dew and dust, it is best not to leave this sitting for too long.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

How to I clean the optics inside my scanner
ANSWER : There’s a small glass on the left side of the big one. There’s one Torx screw holding it. Remove the glass and you have access to the optical mirrors. You can either blow it out with an air can or use a cotton swab and clean the mirrors with that. If the mirror assembly isn’t parked under the glass, then start a copy with the ADF and when the mirror parks, pull out the plug.

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HP OfficeJet Pro 8600

HP3330 – How to Clean Scanner Mirrors
ANSWER : Great instructions. Also check this out on how to disassemble the printer:

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HP OfficeJet Pro 8600

scanner failure
ANSWER : That is a pretty old machine. You won’t be able to get any parts for it. Time to get a new one.

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HP OfficeJet Pro 8600

All panel lights blinking, printer doesnt respond
ANSWER : This is very easy process, you must change a new one

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HP OfficeJet Pro 8600

Clean Printing
ANSWER : Simply look at the drum and the belt. If there is still a latent image on either one, that is what you should replace.

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HP OfficeJet Pro 8600

Product not working suddenly
ANSWER : Since there aren’t any parts available and this looks pretty much fatal, it would be time to buy a new printer.

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HP OfficeJet Pro 8600

no color cart. new & clean
ANSWER : yes

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HP OfficeJet Pro 8600

cleaning nozzles
ANSWER : Inject cleaning solution down into the heads. You can search Epson head cleaning kit on Ebay

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HP OfficeJet Pro 8600