How to clean or maintain the speaker outer surfaces ?

Can we simply use a vacuum cleaner and throw mild watery sprinkle and then use a micro fiber cloth ?
 
I use this:

$_12.JPG
 
Provide the air pressure rating too :D! Else the woofers 'might' get perforated. Air pressure of 50 psig would be sufficient. Don't exceed that please.
 
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