Hello,
I got some blurry aera on a wall. do you know why?
I would like to delet the blue above the wall, do you know how?
https://sketchfab.com/models/3fdfa2747ac94fe39f16a88f88ab8d42
Dear basset,
about the blue: you need to get familiar with the basics! 
The blurry area is probably due to a misalignment, as I told you in a different thread.
Or it could be caused by too strong a simplification since the the real geometry deviates too much from the model
I find by filter selection