I use my braille sense with a silk cover over the unit. I can read the braille 
through the silk. This does 2 things:
1. keeps the cells clean
2. keeps my fingers off the dots (no chance of them getting dirty). 

The silk cover can be cleaned with woolite or even dawn dish soap. I have had 
my sense U2 now for 5 years and all cells still work as new. :) I think I will 
have to order a replacement battery though. the one that came with the unit 
doesn't hold a charge nearly as long as it once did.

-eric

On Feb 4, 2018, at 4:53 PM, Eden wrote:

> Yes, you must must wash your hands a lot. I probably wash my hands 10 to 20 a 
> times a day because I constantly use my display. I also clean it now and put 
> a cover over it. For instance with my first braille sense, cells went bad in 
> 6 months because I was not careful. This time, I had one last for 2 years 
> without any cell problems but now I have. I'm hoping for the best that the 
> new Focus. 
> Eden   
> 
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