Answer:
The information we choose to reveal to the receiver according to the Jo-Hari window is the common knowledge. Jo-Hari window is a technique were could be used to help people get a better understanding with their relationships and others.
Size, cost, and safety are things to consider.
"Cleaning can be difficult" is not a sufficient reason to not buy something. It can be a factor, but everything else is to be taken with much more consideration.
I hope this helps!
~kaikers
