Use a hp deskjet 35200(3500). when unit is printing all lines are blurd and paper gets black streaks all over. The printing is unreadable and smudged.Is there a manner to clean this up?

What causes black lines on paper when printing?
Usually streaks or vertical lines are caused by empty toner cartridge or toner itself is damaged. It's also due to a dirty pick up roller or paper path. You can contact HP Tech Support so they can replace your printer

Depends on whether vertical or horizontal streaks. Go here for guidelines on fixing issues.


http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&objectID=c02206095&prodTypeId=18972&prodSeriesId=4066450

when the print-out shows lines or streaks on the back of the paper when printing single sidedly, this usually means that the fusing unit is dirty or broken. another possible broken part may be the photoconductor unit.

Clean your print head, you got black on head when it was leaking.

Where the original page that you wish scanned/faxed there will be a device called a "scan part". This device "reads" the paper to be faxed/scanned as it passes. It usually is found very near where the paper to be faxed goes in.
If there is a spec of debris on this part it will cause a fine line straight down the document. If its dirty, the document will be too! Just give it a good cleaning and you should be fine.
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Thanks
Len

Changing the print cartridge should solve your problem

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If reprinting did not help, try increasing the print quality mode.
In the application you are printing from, click File, and then click Print. Make sure the printer is selected, and then click Properties.
Select the Paper/Quality tab. In the Print Quality area, choose the next higher quality setting. If the current setting is Draft, choose Normal. If the current setting is Normal, choose Best.
Step three: Print in grayscale (black area streaking only)
If the streaks are in a black area of a black and white printout, change to grayscale printing.
NOTE:- This step does not apply to color printouts.
In the application you are printing from, click File, and then click Print.
Make sure the printer is selected and click Properties.
Click the Color tab, and select Print Grayscale and High Quality.
Step four: Clean the printheads
If the print quality is still bad, clean the printheads.
Make sure the printer is loaded with unused white paper.
Open HP Solution Center.
Click Settings, Print Settings, and then select Printer Toolbox.
Click the Service Tab.
Click Clean Printhead, and then click Clean.
Step five: Align the printheads
If the print quality is still bad, align the printheads.
Make sure the printer is loaded with unused white paper.
Open the printer Toolbox, and select the Printer Services tab.
Click Align Printheads. The Align Printheads window opens. Click Align.
The printer prints an alignment page. The lines in the patterns should appear to be straight. Click OK when the page finishes printing.
Step six: Calibrate the linefeed
If the print quality is still bad, calibrate the linefeed:
Make sure the printer is loaded with unused white paper.
Open the printer Toolbox and select the Printer Services tab.
Click Calibrate Advanced Linefeed. The Advanced Linefeed Calibration window opens. Click OK .
Step seven: Replace one or both printheads
If the print quality is still bad after performing all the above steps, one or both of the printheads will have to be replaced. Print a PQ Diagnostic page to see which printhead should be replaced.
Make sure the printer is loaded with unused white paper.
Press the Setup button.
Press 1 and * simultaneously.
Look at the color blocks labeled Test Pattern 2. Some or all of them could show white horizontal streaks. If none of the blocks are streaked, the printheads are okay.
If the Black block has lines – replace the KY printhead.
If the Cyan block has lines – replace the MC Printhead.
If the Magenta block has lines – replace the MC Printhead.
If the Red block has lines – replace the KY printhead.
If the Green block has lines – replace the KY printhead.

You have useful help if you measure the distance between the defects. If the lines are repetive, use this link http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=110&prodSeriesId=378048&prodTypeId=18972&prodSeriesId=378048&objectID=c00063561

Are you sure this is a Designjet 450 (large format printer) and not a Deskjet 450 (portable printer)? The following assumes you have wispy black streaking on the printed side of the paper. If the streaking is on the back side then post more details of the printer model and the issue.

In either case the most likely cause is a buildup of fibers on the underside of the printheads or carriage, causing wisps of black ink to be dragged on the paper when the carriage reverses direction. You can clean the printer as shown at the following (though the details will be somewhat different for the Designjet or Deskjet....).

Regards,
Bob Headrick, MS MVP Printing/Imaging

That is the problem, you need to expost the track wheels and clean them with a paper towel soaked in rubbing alcohol.