I did some research about cleaning tips for a digital Oscilloscope, and I did one small discovery.
It seems that many Oscilloscope vendors just copying in their user manual of their products an text advice originally written by Tektronix.
Owon copied the text as is and hosting it in their website, RIGOL did the same by changing few words so to not be that obvious that they have copy it too.
Siglent did what RIGOL did, and now there is three versions of the same text. http://www.tek.com/manual-topic/cleaning Text in copy paste.................. by OWON
Do not put or leave the device in a place where the LCD display will be exposed to direct sunlight for long periods of time.
Note: To avoid damage to the oscilloscope or probes, do not expose them to sprays, liquids, or solvents.
Examine the oscilloscope and probes as often as operating conditions require. To clean the exterior surface, perform the following steps:
1. Use a lint-free cloth to remove floating dust on the outside of the oscilloscope and probes. Take care to avoid scratching the glabrous display filter.
2. Use a soft cloth dampened with water to clean the oscilloscope. For more efficient cleaning, you may use an aqueous solution of 75% isopropyl alcohol.
Note: To avoid damage to the surface of the oscilloscope or probes, do not use any corrosive or chemical cleaning agents. Cooked by RIGOL
Clean the loose dust on the outside of the instrument with a lint- free cloth (with
mild detergent or water). When cleaning the LCD, take care to avoid scarifying
it.Cooked by Siglent
Wipe the dust from the instrument and probe surface with a soft cloth. Do not
make any scuffing on the transparent LCD protection screen when clean the LCD
screen.Dear Oscilloscope vendors
The point here is not to fill up the user manual with generic tips, but rather to inform consumers of what to do according the manufacturing quality of the faceplate printed letters and also according the exact properties of the material in use as oscilloscope surface.
And also it is stupid copying generic advices from others, especially when your products does not come with any anti glare filters. Dear Oscilloscope Users
The first advise about removing the dust prior in-depth cleaning it is correct, dust particles can be of any composition or material and they are abrasive.
lint-free cloth in out times called those Microfiber Cleaning Cloths.
An general advice is that those to use wet for cleaning and dry for dusting.
Personally when there is on the screen a stubborn dirt, I use plain wet with water cotton (small ball) and I do a gentle rubbing so the dirt to get wet and gently be removed.
Microfiber Cleaning Cloths will do the last pass when there is no dirt or dust.
Regarding using water mixed with 75% isopropyl alcohol, if your oscilloscope has a painted case, I will advise to test that first in a small area at the rear side.
Silver paint is prone to damage, black or blue paint also.
Totally safe are only non painted surfaces.
If your Oscilloscope becomes yellowish due heavy exposure to sun light, this can not be cleaned.
But if there is a soft contamination at the casing of the DSO caused by cigaret smoke, this can be possibly cleaned by special abrasive cream, also called as acrylic glass scratch remover.
Use all those advices with caution, because not all working environments which oscilloscopes and multimeter are stored are equally innocent as the room of your home.
For example in a industrial environment dark dust could be metallic particles which traveled as smoke from a near by welding machine.
Neither blasting with compressed air seems reasonable, in all cases.
In conclusion prior starting any cleaning process, just stop and think of what type of enemy you have to deal with, and do all your moves with patience.