First tip is to know what agitates him and what makes him bark. Junior doesn't like it when strangers make strange sounds with strange objects - ok lah by that I just mean when the workers who wash the floors/water the plants/do construction work etc. I think he's suspicious of the sounds because you know the equipment all very loud one!! Got ZZZZZ sound and BRSHHHH like that etc

So I think he gets uneasy and barks at them or sth i dunno also

SO WHAT U DO IS u avoid those situations as much as possible.