Did "dirty" sound like it was being used in a different way? It was open for interpretation.
Something other than "has dirt on it"? Yes.
Did you refer to the screen(s) as "it" or "they" or another indirect word? Another indirect word.
Or did you have another way to refer to it/them that was misleading? Yesish.
Was the subject of the first statement an object? Yes.
Or was it first-person, such as "I saw something dirty"? No.
In the second statement, do you use the dirty side? Yes.
Avoid the dirty side? No.
Do something with the dirty side? Yes.
Get in touch with your dirty side? No, though it could be interpreted that way.