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Please remove the screw of the CPU tower to remove the door. I want to clean the RAM and motherboard as they are full of stain. Please put the screws in your pocket till you complete cleaning, otherwise the small crews may disappear(lost), also don't forget to close all the screws on the CPU tower.

Please correct my sentences.
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If you want to clean the (RAM and motherboard)/(inside components of your computer) the first step is to remove the screw(s) of the tower in order to remove the door. Put the screws in your pocket until the cleaning is complete, otherwise (they may get lost)/(you might lose them). Don't forget to put the screws back on the tower as soon as you have finished.
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If you want to clean the (RAM and motherboard)/(inside components of your computer) the first step is to remove the screw(s) of the tower in order to remove the door. Put the screws in your pocket until the cleaning is complete, otherwise (they may get lost)/(you might lose them). Don't forget to put the screws back on the tower as soon as you have finished.
Thank you very much Optilang.

Do we say "door" to the CPU tower's ......?

Also please check some of my sentences below related to the word "screw" :

(1) Please remove the screws using screw driver.
(2) Please close the screws using screw driver.
(3) Please twist the screw on tightly to close it.
(4) Please twist the screw off to remove it.
Hi

Some towers have a door I believe. On my computer I have to remove the screws and then slide the side off.

Please remove the screws with/using a screwdriver.

Please replace the screws .....

Please make sure the screws are replaced securely. Do not over-tighten

Please unscrew the screws.
Thank you Optilang
What you mean by "slide the side-off" in your sentence?
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Hi

I mean I unscrew the side of the case at the back and then pull the side backwards so that it slides out/off.