When working with intelligent cleanup for L intersections, the following rules apply: 
- L-cleanup works with 2 non-collinear wall segments at a time. 
- The wall segments can be any distance apart, as long as they have a possible intersection. 
- When an improper cleanup condition occurs, a tip displays to suggest possible solutions. 
- Wall segments clean up when their respective wall justification lines intersect cleanly with each other. 
- Wall segments that do not intersect are extended to meet in a clean corner condition with intersecting wall justification lines. 
 
- Wall segments that intersect are trimmed to meet in a clean corner condition with intersecting wall justification lines. 
 
-  Select the wall segments to include in the wall cleanup. 
- Click   . .  
- Press Enter for L-cleanup.  
L-cleanup works the same way for arc wall segments.